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Finding the Fourth Proportional to 280,761.30, 387,449.73 and 153,436.90

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Solution

The fourth proportional to 280,761.30, 387,449.73 and 153,436.90 is: 211,742.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,761.30 : 387,449.73 = 153,436.90 : x
  2. Step 2: Convert to fraction form
    280,761.30/387,449.73 = 153,436.90/x
  3. Step 3: Cross multiply
    280,761.30x = 387,449.73 × 153,436.90
  4. Step 4: Simplify right side
    280,761.30x = 59,449,083,539.79
  5. Step 5: Solve for x
    x = 59,449,083,539.79/280,761.30
  6. Step 6: Final answer
    x = 211,742.44

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1.5x scale

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.