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Finding the Fourth Proportional to 86,469.74, 128,844.98 and 77,037.28

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Solution

The fourth proportional to 86,469.74, 128,844.98 and 77,037.28 is: 114,790.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,469.74 : 128,844.98 = 77,037.28 : x
  2. Step 2: Convert to fraction form
    86,469.74/128,844.98 = 77,037.28/x
  3. Step 3: Cross multiply
    86,469.74x = 128,844.98 × 77,037.28
  4. Step 4: Simplify right side
    86,469.74x = 9,925,866,961.49
  5. Step 5: Solve for x
    x = 9,925,866,961.49/86,469.74
  6. Step 6: Final answer
    x = 114,790.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.