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Finding the Fourth Proportional to 86,385.66, 129,285.90 and 53,126.82

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Solution

The fourth proportional to 86,385.66, 129,285.90 and 53,126.82 is: 79,510.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,385.66 : 129,285.90 = 53,126.82 : x
  2. Step 2: Convert to fraction form
    86,385.66/129,285.90 = 53,126.82/x
  3. Step 3: Cross multiply
    86,385.66x = 129,285.90 × 53,126.82
  4. Step 4: Simplify right side
    86,385.66x = 6,868,548,737.84
  5. Step 5: Solve for x
    x = 6,868,548,737.84/86,385.66
  6. Step 6: Final answer
    x = 79,510.29

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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.