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Finding the Fourth Proportional to 398,614.80, 550,081.02 and 217,328.30

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Solution

The fourth proportional to 398,614.80, 550,081.02 and 217,328.30 is: 299,909.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,614.80 : 550,081.02 = 217,328.30 : x
  2. Step 2: Convert to fraction form
    398,614.80/550,081.02 = 217,328.30/x
  3. Step 3: Cross multiply
    398,614.80x = 550,081.02 × 217,328.30
  4. Step 4: Simplify right side
    398,614.80x = 119,548,173,066.25
  5. Step 5: Solve for x
    x = 119,548,173,066.25/398,614.80
  6. Step 6: Final answer
    x = 299,909.01

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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.