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Finding the Fourth Proportional to 707.36, 1,061.28 and 621.44

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Solution

The fourth proportional to 707.36, 1,061.28 and 621.44 is: 932.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.36 : 1,061.28 = 621.44 : x
  2. Step 2: Convert to fraction form
    707.36/1,061.28 = 621.44/x
  3. Step 3: Cross multiply
    707.36x = 1,061.28 × 621.44
  4. Step 4: Simplify right side
    707.36x = 659,521.84
  5. Step 5: Solve for x
    x = 659,521.84/707.36
  6. Step 6: Final answer
    x = 932.37

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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.