Home / 86,521.20-129,672.45-77,117.10

Finding the Fourth Proportional to 86,521.20, 129,672.45 and 77,117.10

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Solution

The fourth proportional to 86,521.20, 129,672.45 and 77,117.10 is: 115,578.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,521.20 : 129,672.45 = 77,117.10 : x
  2. Step 2: Convert to fraction form
    86,521.20/129,672.45 = 77,117.10/x
  3. Step 3: Cross multiply
    86,521.20x = 129,672.45 × 77,117.10
  4. Step 4: Simplify right side
    86,521.20x = 9,999,963,293.90
  5. Step 5: Solve for x
    x = 9,999,963,293.90/86,521.20
  6. Step 6: Final answer
    x = 115,578.19

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1.5x scale

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.