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Finding the Fourth Proportional to 656.01, 905.13 and 390.43

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Solution

The fourth proportional to 656.01, 905.13 and 390.43 is: 538.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.01 : 905.13 = 390.43 : x
  2. Step 2: Convert to fraction form
    656.01/905.13 = 390.43/x
  3. Step 3: Cross multiply
    656.01x = 905.13 × 390.43
  4. Step 4: Simplify right side
    656.01x = 353,389.91
  5. Step 5: Solve for x
    x = 353,389.91/656.01
  6. Step 6: Final answer
    x = 538.70

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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.