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Finding the Fourth Proportional to 612,703.20, 919,414.44 and 257,689.92

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Solution

The fourth proportional to 612,703.20, 919,414.44 and 257,689.92 is: 386,686.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,703.20 : 919,414.44 = 257,689.92 : x
  2. Step 2: Convert to fraction form
    612,703.20/919,414.44 = 257,689.92/x
  3. Step 3: Cross multiply
    612,703.20x = 919,414.44 × 257,689.92
  4. Step 4: Simplify right side
    612,703.20x = 236,923,833,490.45
  5. Step 5: Solve for x
    x = 236,923,833,490.45/612,703.20
  6. Step 6: Final answer
    x = 386,686.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.