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Finding the Fourth Proportional to 935.61, 1,290.81 and 562.31

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Solution

The fourth proportional to 935.61, 1,290.81 and 562.31 is: 775.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    935.61 : 1,290.81 = 562.31 : x
  2. Step 2: Convert to fraction form
    935.61/1,290.81 = 562.31/x
  3. Step 3: Cross multiply
    935.61x = 1,290.81 × 562.31
  4. Step 4: Simplify right side
    935.61x = 725,828.92
  5. Step 5: Solve for x
    x = 725,828.92/935.61
  6. Step 6: Final answer
    x = 775.78

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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.