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Finding the Fourth Proportional to 259,031.69, 388,569.40 and 72,043.19

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Solution

The fourth proportional to 259,031.69, 388,569.40 and 72,043.19 is: 108,070.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,031.69 : 388,569.40 = 72,043.19 : x
  2. Step 2: Convert to fraction form
    259,031.69/388,569.40 = 72,043.19/x
  3. Step 3: Cross multiply
    259,031.69x = 388,569.40 × 72,043.19
  4. Step 4: Simplify right side
    259,031.69x = 27,993,779,112.39
  5. Step 5: Solve for x
    x = 27,993,779,112.39/259,031.69
  6. Step 6: Final answer
    x = 108,070.87

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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.