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Finding the Fourth Proportional to 398,381.55, 549,759.70 and 217,095.05

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Solution

The fourth proportional to 398,381.55, 549,759.70 and 217,095.05 is: 299,587.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,381.55 : 549,759.70 = 217,095.05 : x
  2. Step 2: Convert to fraction form
    398,381.55/549,759.70 = 217,095.05/x
  3. Step 3: Cross multiply
    398,381.55x = 549,759.70 × 217,095.05
  4. Step 4: Simplify right side
    398,381.55x = 119,350,109,559.49
  5. Step 5: Solve for x
    x = 119,350,109,559.49/398,381.55
  6. Step 6: Final answer
    x = 299,587.44

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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.