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Finding the Fourth Proportional to 2,872.40, 4,308.60 and 924.80

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Solution

The fourth proportional to 2,872.40, 4,308.60 and 924.80 is: 1,387.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,872.40 : 4,308.60 = 924.80 : x
  2. Step 2: Convert to fraction form
    2,872.40/4,308.60 = 924.80/x
  3. Step 3: Cross multiply
    2,872.40x = 4,308.60 × 924.80
  4. Step 4: Simplify right side
    2,872.40x = 3,984,593.28
  5. Step 5: Solve for x
    x = 3,984,593.28/2,872.40
  6. Step 6: Final answer
    x = 1,387.20

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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.