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Finding the Fourth Proportional to 500.76, 691.06 and 279.68

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Solution

The fourth proportional to 500.76, 691.06 and 279.68 is: 385.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.76 : 691.06 = 279.68 : x
  2. Step 2: Convert to fraction form
    500.76/691.06 = 279.68/x
  3. Step 3: Cross multiply
    500.76x = 691.06 × 279.68
  4. Step 4: Simplify right side
    500.76x = 193,275.66
  5. Step 5: Solve for x
    x = 193,275.66/500.76
  6. Step 6: Final answer
    x = 385.96

Related Problems

Find fourth proportional to 250.38, 345.53 and 139.84
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Double scale
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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.