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Finding the Fourth Proportional to 398,479.70, 549,902.40 and 217,191.80

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Solution

The fourth proportional to 398,479.70, 549,902.40 and 217,191.80 is: 299,724.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,479.70 : 549,902.40 = 217,191.80 : x
  2. Step 2: Convert to fraction form
    398,479.70/549,902.40 = 217,191.80/x
  3. Step 3: Cross multiply
    398,479.70x = 549,902.40 × 217,191.80
  4. Step 4: Simplify right side
    398,479.70x = 119,434,292,080.32
  5. Step 5: Solve for x
    x = 119,434,292,080.32/398,479.70
  6. Step 6: Final answer
    x = 299,724.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.