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Finding the Fourth Proportional to 55.61, 76.65 and 43.31

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Solution

The fourth proportional to 55.61, 76.65 and 43.31 is: 59.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.61 : 76.65 = 43.31 : x
  2. Step 2: Convert to fraction form
    55.61/76.65 = 43.31/x
  3. Step 3: Cross multiply
    55.61x = 76.65 × 43.31
  4. Step 4: Simplify right side
    55.61x = 3,319.71
  5. Step 5: Solve for x
    x = 3,319.71/55.61
  6. Step 6: Final answer
    x = 59.70

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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.