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Finding the Fourth Proportional to 86,877.20, 130,315.80 and 85,710.80

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Solution

The fourth proportional to 86,877.20, 130,315.80 and 85,710.80 is: 128,566.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,877.20 : 130,315.80 = 85,710.80 : x
  2. Step 2: Convert to fraction form
    86,877.20/130,315.80 = 85,710.80/x
  3. Step 3: Cross multiply
    86,877.20x = 130,315.80 × 85,710.80
  4. Step 4: Simplify right side
    86,877.20x = 11,169,471,470.64
  5. Step 5: Solve for x
    x = 11,169,471,470.64/86,877.20
  6. Step 6: Final answer
    x = 128,566.20

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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.