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Finding the Fourth Proportional to 391,480.43, 540,280.53 and 219,397.55

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Solution

The fourth proportional to 391,480.43, 540,280.53 and 219,397.55 is: 302,789.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,480.43 : 540,280.53 = 219,397.55 : x
  2. Step 2: Convert to fraction form
    391,480.43/540,280.53 = 219,397.55/x
  3. Step 3: Cross multiply
    391,480.43x = 540,280.53 × 219,397.55
  4. Step 4: Simplify right side
    391,480.43x = 118,536,221,893.30
  5. Step 5: Solve for x
    x = 118,536,221,893.30/391,480.43
  6. Step 6: Final answer
    x = 302,789.65

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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.