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Finding the Fourth Proportional to 485,671.80, 669,937.50 and 378,071.40

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Solution

The fourth proportional to 485,671.80, 669,937.50 and 378,071.40 is: 521,513.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,671.80 : 669,937.50 = 378,071.40 : x
  2. Step 2: Convert to fraction form
    485,671.80/669,937.50 = 378,071.40/x
  3. Step 3: Cross multiply
    485,671.80x = 669,937.50 × 378,071.40
  4. Step 4: Simplify right side
    485,671.80x = 253,284,208,537.50
  5. Step 5: Solve for x
    x = 253,284,208,537.50/485,671.80
  6. Step 6: Final answer
    x = 521,513.11

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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.