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Finding the Fourth Proportional to 8,923.60, 13,417.80 and 8,729.20

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Solution

The fourth proportional to 8,923.60, 13,417.80 and 8,729.20 is: 13,125.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,923.60 : 13,417.80 = 8,729.20 : x
  2. Step 2: Convert to fraction form
    8,923.60/13,417.80 = 8,729.20/x
  3. Step 3: Cross multiply
    8,923.60x = 13,417.80 × 8,729.20
  4. Step 4: Simplify right side
    8,923.60x = 117,126,659.76
  5. Step 5: Solve for x
    x = 117,126,659.76/8,923.60
  6. Step 6: Final answer
    x = 13,125.49

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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.