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Finding the Fourth Proportional to 390,672.52, 539,102.58 and 218,561.08

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Solution

The fourth proportional to 390,672.52, 539,102.58 and 218,561.08 is: 301,600.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,672.52 : 539,102.58 = 218,561.08 : x
  2. Step 2: Convert to fraction form
    390,672.52/539,102.58 = 218,561.08/x
  3. Step 3: Cross multiply
    390,672.52x = 539,102.58 × 218,561.08
  4. Step 4: Simplify right side
    390,672.52x = 117,826,842,115.59
  5. Step 5: Solve for x
    x = 117,826,842,115.59/390,672.52
  6. Step 6: Final answer
    x = 301,600.03

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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.