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Finding the Fourth Proportional to 278,718.96, 418,130.28 and 91,743.60

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Solution

The fourth proportional to 278,718.96, 418,130.28 and 91,743.60 is: 137,632.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,718.96 : 418,130.28 = 91,743.60 : x
  2. Step 2: Convert to fraction form
    278,718.96/418,130.28 = 91,743.60/x
  3. Step 3: Cross multiply
    278,718.96x = 418,130.28 × 91,743.60
  4. Step 4: Simplify right side
    278,718.96x = 38,360,777,156.21
  5. Step 5: Solve for x
    x = 38,360,777,156.21/278,718.96
  6. Step 6: Final answer
    x = 137,632.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.