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Finding the Fourth Proportional to 8,931.80, 13,397.70 and 8,778.20

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Solution

The fourth proportional to 8,931.80, 13,397.70 and 8,778.20 is: 13,167.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,931.80 : 13,397.70 = 8,778.20 : x
  2. Step 2: Convert to fraction form
    8,931.80/13,397.70 = 8,778.20/x
  3. Step 3: Cross multiply
    8,931.80x = 13,397.70 × 8,778.20
  4. Step 4: Simplify right side
    8,931.80x = 117,607,690.14
  5. Step 5: Solve for x
    x = 117,607,690.14/8,931.80
  6. Step 6: Final answer
    x = 13,167.30

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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.