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Finding the Fourth Proportional to 486,971.76, 672,087.77 and 280,235.90

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Solution

The fourth proportional to 486,971.76, 672,087.77 and 280,235.90 is: 386,763.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,971.76 : 672,087.77 = 280,235.90 : x
  2. Step 2: Convert to fraction form
    486,971.76/672,087.77 = 280,235.90/x
  3. Step 3: Cross multiply
    486,971.76x = 672,087.77 × 280,235.90
  4. Step 4: Simplify right side
    486,971.76x = 188,343,120,230.70
  5. Step 5: Solve for x
    x = 188,343,120,230.70/486,971.76
  6. Step 6: Final answer
    x = 386,763.95

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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.