Home / 86,721.15-129,988.41-56,724.09

Finding the Fourth Proportional to 86,721.15, 129,988.41 and 56,724.09

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Solution

The fourth proportional to 86,721.15, 129,988.41 and 56,724.09 is: 85,025.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,721.15 : 129,988.41 = 56,724.09 : x
  2. Step 2: Convert to fraction form
    86,721.15/129,988.41 = 56,724.09/x
  3. Step 3: Cross multiply
    86,721.15x = 129,988.41 × 56,724.09
  4. Step 4: Simplify right side
    86,721.15x = 7,373,474,267.80
  5. Step 5: Solve for x
    x = 7,373,474,267.80/86,721.15
  6. Step 6: Final answer
    x = 85,025.10

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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.