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Finding the Fourth Proportional to 245,559.90, 338,869.26 and 138,129.87

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Solution

The fourth proportional to 245,559.90, 338,869.26 and 138,129.87 is: 190,617.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,559.90 : 338,869.26 = 138,129.87 : x
  2. Step 2: Convert to fraction form
    245,559.90/338,869.26 = 138,129.87/x
  3. Step 3: Cross multiply
    245,559.90x = 338,869.26 × 138,129.87
  4. Step 4: Simplify right side
    245,559.90x = 46,807,966,830.80
  5. Step 5: Solve for x
    x = 46,807,966,830.80/245,559.90
  6. Step 6: Final answer
    x = 190,617.31

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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.