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Finding the Fourth Proportional to 280,987.89, 387,766.35 and 153,660.75

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Solution

The fourth proportional to 280,987.89, 387,766.35 and 153,660.75 is: 212,053.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,987.89 : 387,766.35 = 153,660.75 : x
  2. Step 2: Convert to fraction form
    280,987.89/387,766.35 = 153,660.75/x
  3. Step 3: Cross multiply
    280,987.89x = 387,766.35 × 153,660.75
  4. Step 4: Simplify right side
    280,987.89x = 59,584,468,165.76
  5. Step 5: Solve for x
    x = 59,584,468,165.76/280,987.89
  6. Step 6: Final answer
    x = 212,053.51

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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.