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Finding the Fourth Proportional to 485,670.80, 669,936.12 and 378,070.40

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Solution

The fourth proportional to 485,670.80, 669,936.12 and 378,070.40 is: 521,511.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,670.80 : 669,936.12 = 378,070.40 : x
  2. Step 2: Convert to fraction form
    485,670.80/669,936.12 = 378,070.40/x
  3. Step 3: Cross multiply
    485,670.80x = 669,936.12 × 378,070.40
  4. Step 4: Simplify right side
    485,670.80x = 253,283,016,862.85
  5. Step 5: Solve for x
    x = 253,283,016,862.85/485,670.80
  6. Step 6: Final answer
    x = 521,511.73

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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.