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Finding the Fourth Proportional to 86,086.76, 128,264.90 and 81,252.36

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Solution

The fourth proportional to 86,086.76, 128,264.90 and 81,252.36 is: 121,061.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,086.76 : 128,264.90 = 81,252.36 : x
  2. Step 2: Convert to fraction form
    86,086.76/128,264.90 = 81,252.36/x
  3. Step 3: Cross multiply
    86,086.76x = 128,264.90 × 81,252.36
  4. Step 4: Simplify right side
    86,086.76x = 10,421,825,423.90
  5. Step 5: Solve for x
    x = 10,421,825,423.90/86,086.76
  6. Step 6: Final answer
    x = 121,061.89

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1.5x scale

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.