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Finding the Fourth Proportional to 86,520.60, 129,780.90 and 77,189.40

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Solution

The fourth proportional to 86,520.60, 129,780.90 and 77,189.40 is: 115,784.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,520.60 : 129,780.90 = 77,189.40 : x
  2. Step 2: Convert to fraction form
    86,520.60/129,780.90 = 77,189.40/x
  3. Step 3: Cross multiply
    86,520.60x = 129,780.90 × 77,189.40
  4. Step 4: Simplify right side
    86,520.60x = 10,017,709,802.46
  5. Step 5: Solve for x
    x = 10,017,709,802.46/86,520.60
  6. Step 6: Final answer
    x = 115,784.10

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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.