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Finding the Fourth Proportional to 835.78, 1,153.48 and 486.47

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Solution

The fourth proportional to 835.78, 1,153.48 and 486.47 is: 671.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    835.78 : 1,153.48 = 486.47 : x
  2. Step 2: Convert to fraction form
    835.78/1,153.48 = 486.47/x
  3. Step 3: Cross multiply
    835.78x = 1,153.48 × 486.47
  4. Step 4: Simplify right side
    835.78x = 561,133.42
  5. Step 5: Solve for x
    x = 561,133.42/835.78
  6. Step 6: Final answer
    x = 671.39

Related Problems

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Half scale
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Double scale
Find fourth proportional to 836.78, 1,154.86 and 487.47
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.