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Finding the Fourth Proportional to 835.68, 1,151.82 and 638.76

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Solution

The fourth proportional to 835.68, 1,151.82 and 638.76 is: 880.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.68 : 1,151.82 = 638.76 : x
  2. Step 2: Convert to fraction form
    835.68/1,151.82 = 638.76/x
  3. Step 3: Cross multiply
    835.68x = 1,151.82 × 638.76
  4. Step 4: Simplify right side
    835.68x = 735,736.54
  5. Step 5: Solve for x
    x = 735,736.54/835.68
  6. Step 6: Final answer
    x = 880.40

Related Problems

Find fourth proportional to 417.84, 575.91 and 319.38
Half scale
Find fourth proportional to 1,671.36, 2,303.64 and 1,277.52
Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.