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Finding the Fourth Proportional to 57,430.80, 86,146.20 and 17,991.90

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Solution

The fourth proportional to 57,430.80, 86,146.20 and 17,991.90 is: 26,987.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,430.80 : 86,146.20 = 17,991.90 : x
  2. Step 2: Convert to fraction form
    57,430.80/86,146.20 = 17,991.90/x
  3. Step 3: Cross multiply
    57,430.80x = 86,146.20 × 17,991.90
  4. Step 4: Simplify right side
    57,430.80x = 1,549,933,815.78
  5. Step 5: Solve for x
    x = 1,549,933,815.78/57,430.80
  6. Step 6: Final answer
    x = 26,987.85

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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.