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Finding the Fourth Proportional to 390,741.59, 539,191.26 and 218,650.65

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Solution

The fourth proportional to 390,741.59, 539,191.26 and 218,650.65 is: 301,719.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,741.59 : 539,191.26 = 218,650.65 : x
  2. Step 2: Convert to fraction form
    390,741.59/539,191.26 = 218,650.65/x
  3. Step 3: Cross multiply
    390,741.59x = 539,191.26 × 218,650.65
  4. Step 4: Simplify right side
    390,741.59x = 117,894,519,473.32
  5. Step 5: Solve for x
    x = 117,894,519,473.32/390,741.59
  6. Step 6: Final answer
    x = 301,719.92

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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.