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Finding the Fourth Proportional to 55.99, 77.29 and 42.88

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Solution

The fourth proportional to 55.99, 77.29 and 42.88 is: 59.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.99 : 77.29 = 42.88 : x
  2. Step 2: Convert to fraction form
    55.99/77.29 = 42.88/x
  3. Step 3: Cross multiply
    55.99x = 77.29 × 42.88
  4. Step 4: Simplify right side
    55.99x = 3,314.20
  5. Step 5: Solve for x
    x = 3,314.20/55.99
  6. Step 6: Final answer
    x = 59.19

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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.