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Finding the Fourth Proportional to 643,030.30, 887,338.56 and 356,539.78

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Solution

The fourth proportional to 643,030.30, 887,338.56 and 356,539.78 is: 492,000.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,030.30 : 887,338.56 = 356,539.78 : x
  2. Step 2: Convert to fraction form
    643,030.30/887,338.56 = 356,539.78/x
  3. Step 3: Cross multiply
    643,030.30x = 887,338.56 × 356,539.78
  4. Step 4: Simplify right side
    643,030.30x = 316,371,494,967.92
  5. Step 5: Solve for x
    x = 316,371,494,967.92/643,030.30
  6. Step 6: Final answer
    x = 492,000.91

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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.