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Finding the Fourth Proportional to 76.90, 115.35 and 59.02

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Solution

The fourth proportional to 76.90, 115.35 and 59.02 is: 88.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.90 : 115.35 = 59.02 : x
  2. Step 2: Convert to fraction form
    76.90/115.35 = 59.02/x
  3. Step 3: Cross multiply
    76.90x = 115.35 × 59.02
  4. Step 4: Simplify right side
    76.90x = 6,807.96
  5. Step 5: Solve for x
    x = 6,807.96/76.90
  6. Step 6: Final answer
    x = 88.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.