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Finding the Fourth Proportional to 213,909.30, 295,102.17 and 128,979.18

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Solution

The fourth proportional to 213,909.30, 295,102.17 and 128,979.18 is: 177,935.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,909.30 : 295,102.17 = 128,979.18 : x
  2. Step 2: Convert to fraction form
    213,909.30/295,102.17 = 128,979.18/x
  3. Step 3: Cross multiply
    213,909.30x = 295,102.17 × 128,979.18
  4. Step 4: Simplify right side
    213,909.30x = 38,062,035,902.82
  5. Step 5: Solve for x
    x = 38,062,035,902.82/213,909.30
  6. Step 6: Final answer
    x = 177,935.40

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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.