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Finding the Fourth Proportional to 245,586.28, 338,928.74 and 138,149.90

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Solution

The fourth proportional to 245,586.28, 338,928.74 and 138,149.90 is: 190,657.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,586.28 : 338,928.74 = 138,149.90 : x
  2. Step 2: Convert to fraction form
    245,586.28/338,928.74 = 138,149.90/x
  3. Step 3: Cross multiply
    245,586.28x = 338,928.74 × 138,149.90
  4. Step 4: Simplify right side
    245,586.28x = 46,822,971,538.13
  5. Step 5: Solve for x
    x = 46,822,971,538.13/245,586.28
  6. Step 6: Final answer
    x = 190,657.93

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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.