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Finding the Fourth Proportional to 280,715.44, 387,387.78 and 153,388.30

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Solution

The fourth proportional to 280,715.44, 387,387.78 and 153,388.30 is: 211,676.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,715.44 : 387,387.78 = 153,388.30 : x
  2. Step 2: Convert to fraction form
    280,715.44/387,387.78 = 153,388.30/x
  3. Step 3: Cross multiply
    280,715.44x = 387,387.78 × 153,388.30
  4. Step 4: Simplify right side
    280,715.44x = 59,420,753,014.97
  5. Step 5: Solve for x
    x = 59,420,753,014.97/280,715.44
  6. Step 6: Final answer
    x = 211,676.11

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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.