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Finding the Fourth Proportional to 86,740.80, 130,111.20 and 81,038.40

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Solution

The fourth proportional to 86,740.80, 130,111.20 and 81,038.40 is: 121,557.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,740.80 : 130,111.20 = 81,038.40 : x
  2. Step 2: Convert to fraction form
    86,740.80/130,111.20 = 81,038.40/x
  3. Step 3: Cross multiply
    86,740.80x = 130,111.20 × 81,038.40
  4. Step 4: Simplify right side
    86,740.80x = 10,544,003,470.08
  5. Step 5: Solve for x
    x = 10,544,003,470.08/86,740.80
  6. Step 6: Final answer
    x = 121,557.60

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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.