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Finding the Fourth Proportional to 391,387.46, 540,123.48 and 219,318.26

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Solution

The fourth proportional to 391,387.46, 540,123.48 and 219,318.26 is: 302,664.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,387.46 : 540,123.48 = 219,318.26 : x
  2. Step 2: Convert to fraction form
    391,387.46/540,123.48 = 219,318.26/x
  3. Step 3: Cross multiply
    391,387.46x = 540,123.48 × 219,318.26
  4. Step 4: Simplify right side
    391,387.46x = 118,458,941,818.75
  5. Step 5: Solve for x
    x = 118,458,941,818.75/391,387.46
  6. Step 6: Final answer
    x = 302,664.12

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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.