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Finding the Fourth Proportional to 218,012.16, 300,939 and 127,397.60

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Solution

The fourth proportional to 218,012.16, 300,939 and 127,397.60 is: 175,856.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,012.16 : 300,939 = 127,397.60 : x
  2. Step 2: Convert to fraction form
    218,012.16/300,939 = 127,397.60/x
  3. Step 3: Cross multiply
    218,012.16x = 300,939 × 127,397.60
  4. Step 4: Simplify right side
    218,012.16x = 38,338,906,346.40
  5. Step 5: Solve for x
    x = 38,338,906,346.40/218,012.16
  6. Step 6: Final answer
    x = 175,856.73

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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.