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Finding the Fourth Proportional to 707.61, 976.50 and 392.87

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Solution

The fourth proportional to 707.61, 976.50 and 392.87 is: 542.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.61 : 976.50 = 392.87 : x
  2. Step 2: Convert to fraction form
    707.61/976.50 = 392.87/x
  3. Step 3: Cross multiply
    707.61x = 976.50 × 392.87
  4. Step 4: Simplify right side
    707.61x = 383,637.56
  5. Step 5: Solve for x
    x = 383,637.56/707.61
  6. Step 6: Final answer
    x = 542.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.