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Finding the Fourth Proportional to 86,561.40, 129,842.10 and 57,012.60

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Solution

The fourth proportional to 86,561.40, 129,842.10 and 57,012.60 is: 85,518.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,561.40 : 129,842.10 = 57,012.60 : x
  2. Step 2: Convert to fraction form
    86,561.40/129,842.10 = 57,012.60/x
  3. Step 3: Cross multiply
    86,561.40x = 129,842.10 × 57,012.60
  4. Step 4: Simplify right side
    86,561.40x = 7,402,635,710.46
  5. Step 5: Solve for x
    x = 7,402,635,710.46/86,561.40
  6. Step 6: Final answer
    x = 85,518.90

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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.