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Finding the Fourth Proportional to 932.81, 1,399.40 and 316.49

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Solution

The fourth proportional to 932.81, 1,399.40 and 316.49 is: 474.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    932.81 : 1,399.40 = 316.49 : x
  2. Step 2: Convert to fraction form
    932.81/1,399.40 = 316.49/x
  3. Step 3: Cross multiply
    932.81x = 1,399.40 × 316.49
  4. Step 4: Simplify right side
    932.81x = 442,899.21
  5. Step 5: Solve for x
    x = 442,899.21/932.81
  6. Step 6: Final answer
    x = 474.80

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.