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Finding the Fourth Proportional to 218,312.60, 326,812.80 and 129,520.40

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Solution

The fourth proportional to 218,312.60, 326,812.80 and 129,520.40 is: 193,891.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,312.60 : 326,812.80 = 129,520.40 : x
  2. Step 2: Convert to fraction form
    218,312.60/326,812.80 = 129,520.40/x
  3. Step 3: Cross multiply
    218,312.60x = 326,812.80 × 129,520.40
  4. Step 4: Simplify right side
    218,312.60x = 42,328,924,581.12
  5. Step 5: Solve for x
    x = 42,328,924,581.12/218,312.60
  6. Step 6: Final answer
    x = 193,891.35

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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.