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Finding the Fourth Proportional to 245,587.78, 338,930.81 and 138,151.40

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Solution

The fourth proportional to 245,587.78, 338,930.81 and 138,151.40 is: 190,660.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,587.78 : 338,930.81 = 138,151.40 : x
  2. Step 2: Convert to fraction form
    245,587.78/338,930.81 = 138,151.40/x
  3. Step 3: Cross multiply
    245,587.78x = 338,930.81 × 138,151.40
  4. Step 4: Simplify right side
    245,587.78x = 46,823,765,904.63
  5. Step 5: Solve for x
    x = 46,823,765,904.63/245,587.78
  6. Step 6: Final answer
    x = 190,660.00

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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.