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Finding the Fourth Proportional to 218,712.60, 328,068.90 and 129,920.40

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Solution

The fourth proportional to 218,712.60, 328,068.90 and 129,920.40 is: 194,880.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,712.60 : 328,068.90 = 129,920.40 : x
  2. Step 2: Convert to fraction form
    218,712.60/328,068.90 = 129,920.40/x
  3. Step 3: Cross multiply
    218,712.60x = 328,068.90 × 129,920.40
  4. Step 4: Simplify right side
    218,712.60x = 42,622,842,715.56
  5. Step 5: Solve for x
    x = 42,622,842,715.56/218,712.60
  6. Step 6: Final answer
    x = 194,880.60

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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.