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Finding the Fourth Proportional to 438,434.40, 656,339.40 and 391,195.20

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Solution

The fourth proportional to 438,434.40, 656,339.40 and 391,195.20 is: 585,621.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,434.40 : 656,339.40 = 391,195.20 : x
  2. Step 2: Convert to fraction form
    438,434.40/656,339.40 = 391,195.20/x
  3. Step 3: Cross multiply
    438,434.40x = 656,339.40 × 391,195.20
  4. Step 4: Simplify right side
    438,434.40x = 256,756,822,850.88
  5. Step 5: Solve for x
    x = 256,756,822,850.88/438,434.40
  6. Step 6: Final answer
    x = 585,621.98

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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.