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Finding the Fourth Proportional to 485,144.54, 669,441.35 and 278,402.30

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Solution

The fourth proportional to 485,144.54, 669,441.35 and 278,402.30 is: 384,161.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,144.54 : 669,441.35 = 278,402.30 : x
  2. Step 2: Convert to fraction form
    485,144.54/669,441.35 = 278,402.30/x
  3. Step 3: Cross multiply
    485,144.54x = 669,441.35 × 278,402.30
  4. Step 4: Simplify right side
    485,144.54x = 186,374,011,555.11
  5. Step 5: Solve for x
    x = 186,374,011,555.11/485,144.54
  6. Step 6: Final answer
    x = 384,161.82

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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.