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Finding the Fourth Proportional to 661,321.57, 912,708.18 and 389,414.76

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Solution

The fourth proportional to 661,321.57, 912,708.18 and 389,414.76 is: 537,442.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,321.57 : 912,708.18 = 389,414.76 : x
  2. Step 2: Convert to fraction form
    661,321.57/912,708.18 = 389,414.76/x
  3. Step 3: Cross multiply
    661,321.57x = 912,708.18 × 389,414.76
  4. Step 4: Simplify right side
    661,321.57x = 355,422,036,864.74
  5. Step 5: Solve for x
    x = 355,422,036,864.74/661,321.57
  6. Step 6: Final answer
    x = 537,442.08

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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.