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Finding the Fourth Proportional to 929.40, 1,393.05 and 381.29

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Solution

The fourth proportional to 929.40, 1,393.05 and 381.29 is: 571.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.40 : 1,393.05 = 381.29 : x
  2. Step 2: Convert to fraction form
    929.40/1,393.05 = 381.29/x
  3. Step 3: Cross multiply
    929.40x = 1,393.05 × 381.29
  4. Step 4: Simplify right side
    929.40x = 531,149.07
  5. Step 5: Solve for x
    x = 531,149.07/929.40
  6. Step 6: Final answer
    x = 571.50

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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.