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Finding the Fourth Proportional to 86,687.08, 130,057.18 and 77,745.89

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Solution

The fourth proportional to 86,687.08, 130,057.18 and 77,745.89 is: 116,642.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,687.08 : 130,057.18 = 77,745.89 : x
  2. Step 2: Convert to fraction form
    86,687.08/130,057.18 = 77,745.89/x
  3. Step 3: Cross multiply
    86,687.08x = 130,057.18 × 77,745.89
  4. Step 4: Simplify right side
    86,687.08x = 10,111,411,340.77
  5. Step 5: Solve for x
    x = 10,111,411,340.77/86,687.08
  6. Step 6: Final answer
    x = 116,642.66

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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.