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Finding the Fourth Proportional to 386,128.76, 532,879.02 and 216,417.40

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Solution

The fourth proportional to 386,128.76, 532,879.02 and 216,417.40 is: 298,667.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,128.76 : 532,879.02 = 216,417.40 : x
  2. Step 2: Convert to fraction form
    386,128.76/532,879.02 = 216,417.40/x
  3. Step 3: Cross multiply
    386,128.76x = 532,879.02 × 216,417.40
  4. Step 4: Simplify right side
    386,128.76x = 115,324,292,022.95
  5. Step 5: Solve for x
    x = 115,324,292,022.95/386,128.76
  6. Step 6: Final answer
    x = 298,667.97

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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.