Home / 86,651.16-129,920.70-56,979.12

Finding the Fourth Proportional to 86,651.16, 129,920.70 and 56,979.12

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Solution

The fourth proportional to 86,651.16, 129,920.70 and 56,979.12 is: 85,431.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,651.16 : 129,920.70 = 56,979.12 : x
  2. Step 2: Convert to fraction form
    86,651.16/129,920.70 = 56,979.12/x
  3. Step 3: Cross multiply
    86,651.16x = 129,920.70 × 56,979.12
  4. Step 4: Simplify right side
    86,651.16x = 7,402,767,155.78
  5. Step 5: Solve for x
    x = 7,402,767,155.78/86,651.16
  6. Step 6: Final answer
    x = 85,431.83

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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.