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Finding the Fourth Proportional to 939.84, 1,407.84 and 425.28

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Solution

The fourth proportional to 939.84, 1,407.84 and 425.28 is: 637.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.84 : 1,407.84 = 425.28 : x
  2. Step 2: Convert to fraction form
    939.84/1,407.84 = 425.28/x
  3. Step 3: Cross multiply
    939.84x = 1,407.84 × 425.28
  4. Step 4: Simplify right side
    939.84x = 598,726.20
  5. Step 5: Solve for x
    x = 598,726.20/939.84
  6. Step 6: Final answer
    x = 637.05

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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.