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Finding the Fourth Proportional to 390,957.92, 539,492.11 and 218,836.47

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Solution

The fourth proportional to 390,957.92, 539,492.11 and 218,836.47 is: 301,977.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,957.92 : 539,492.11 = 218,836.47 : x
  2. Step 2: Convert to fraction form
    390,957.92/539,492.11 = 218,836.47/x
  3. Step 3: Cross multiply
    390,957.92x = 539,492.11 × 218,836.47
  4. Step 4: Simplify right side
    390,957.92x = 118,060,548,617.57
  5. Step 5: Solve for x
    x = 118,060,548,617.57/390,957.92
  6. Step 6: Final answer
    x = 301,977.63

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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.