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Finding the Fourth Proportional to 287,442.20, 431,163.30 and 265,790.90

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Solution

The fourth proportional to 287,442.20, 431,163.30 and 265,790.90 is: 398,686.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,442.20 : 431,163.30 = 265,790.90 : x
  2. Step 2: Convert to fraction form
    287,442.20/431,163.30 = 265,790.90/x
  3. Step 3: Cross multiply
    287,442.20x = 431,163.30 × 265,790.90
  4. Step 4: Simplify right side
    287,442.20x = 114,599,281,553.97
  5. Step 5: Solve for x
    x = 114,599,281,553.97/287,442.20
  6. Step 6: Final answer
    x = 398,686.35

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1.5x scale

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.