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Finding the Fourth Proportional to 923.71, 1,385.05 and 631.54

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Solution

The fourth proportional to 923.71, 1,385.05 and 631.54 is: 946.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.71 : 1,385.05 = 631.54 : x
  2. Step 2: Convert to fraction form
    923.71/1,385.05 = 631.54/x
  3. Step 3: Cross multiply
    923.71x = 1,385.05 × 631.54
  4. Step 4: Simplify right side
    923.71x = 874,708.02
  5. Step 5: Solve for x
    x = 874,708.02/923.71
  6. Step 6: Final answer
    x = 946.96

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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.