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Finding the Fourth Proportional to 281,279.78, 388,151.12 and 153,930.76

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Solution

The fourth proportional to 281,279.78, 388,151.12 and 153,930.76 is: 212,416.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,279.78 : 388,151.12 = 153,930.76 : x
  2. Step 2: Convert to fraction form
    281,279.78/388,151.12 = 153,930.76/x
  3. Step 3: Cross multiply
    281,279.78x = 388,151.12 × 153,930.76
  4. Step 4: Simplify right side
    281,279.78x = 59,748,396,896.45
  5. Step 5: Solve for x
    x = 59,748,396,896.45/281,279.78
  6. Step 6: Final answer
    x = 212,416.25

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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.