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Finding the Fourth Proportional to 86,111.70, 129,167.55 and 66,428.70

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Solution

The fourth proportional to 86,111.70, 129,167.55 and 66,428.70 is: 99,643.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,111.70 : 129,167.55 = 66,428.70 : x
  2. Step 2: Convert to fraction form
    86,111.70/129,167.55 = 66,428.70/x
  3. Step 3: Cross multiply
    86,111.70x = 129,167.55 × 66,428.70
  4. Step 4: Simplify right side
    86,111.70x = 8,580,432,428.69
  5. Step 5: Solve for x
    x = 8,580,432,428.69/86,111.70
  6. Step 6: Final answer
    x = 99,643.05

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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.