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Finding the Fourth Proportional to 86,531.40, 129,797.10 and 53,143.20

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Solution

The fourth proportional to 86,531.40, 129,797.10 and 53,143.20 is: 79,714.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,531.40 : 129,797.10 = 53,143.20 : x
  2. Step 2: Convert to fraction form
    86,531.40/129,797.10 = 53,143.20/x
  3. Step 3: Cross multiply
    86,531.40x = 129,797.10 × 53,143.20
  4. Step 4: Simplify right side
    86,531.40x = 6,897,833,244.72
  5. Step 5: Solve for x
    x = 6,897,833,244.72/86,531.40
  6. Step 6: Final answer
    x = 79,714.80

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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.