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Finding the Fourth Proportional to 86,658.78, 130,036.23 and 42,285.90

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Solution

The fourth proportional to 86,658.78, 130,036.23 and 42,285.90 is: 63,452.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,658.78 : 130,036.23 = 42,285.90 : x
  2. Step 2: Convert to fraction form
    86,658.78/130,036.23 = 42,285.90/x
  3. Step 3: Cross multiply
    86,658.78x = 130,036.23 × 42,285.90
  4. Step 4: Simplify right side
    86,658.78x = 5,498,699,018.16
  5. Step 5: Solve for x
    x = 5,498,699,018.16/86,658.78
  6. Step 6: Final answer
    x = 63,452.30

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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.