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Finding the Fourth Proportional to 398,430.72, 549,818.34 and 217,138.80

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Solution

The fourth proportional to 398,430.72, 549,818.34 and 217,138.80 is: 299,642.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,430.72 : 549,818.34 = 217,138.80 : x
  2. Step 2: Convert to fraction form
    398,430.72/549,818.34 = 217,138.80/x
  3. Step 3: Cross multiply
    398,430.72x = 549,818.34 × 217,138.80
  4. Step 4: Simplify right side
    398,430.72x = 119,386,894,565.59
  5. Step 5: Solve for x
    x = 119,386,894,565.59/398,430.72
  6. Step 6: Final answer
    x = 299,642.80

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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.