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Finding the Fourth Proportional to 662,505.30, 913,951.62 and 390,387.42

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Solution

The fourth proportional to 662,505.30, 913,951.62 and 390,387.42 is: 538,554.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,505.30 : 913,951.62 = 390,387.42 : x
  2. Step 2: Convert to fraction form
    662,505.30/913,951.62 = 390,387.42/x
  3. Step 3: Cross multiply
    662,505.30x = 913,951.62 × 390,387.42
  4. Step 4: Simplify right side
    662,505.30x = 356,795,214,936.62
  5. Step 5: Solve for x
    x = 356,795,214,936.62/662,505.30
  6. Step 6: Final answer
    x = 538,554.51

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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.