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Finding the Fourth Proportional to 1,239,582.80, 1,859,374.20 and 861,669.20

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Solution

The fourth proportional to 1,239,582.80, 1,859,374.20 and 861,669.20 is: 1,292,503.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239,582.80 : 1,859,374.20 = 861,669.20 : x
  2. Step 2: Convert to fraction form
    1,239,582.80/1,859,374.20 = 861,669.20/x
  3. Step 3: Cross multiply
    1,239,582.80x = 1,859,374.20 × 861,669.20
  4. Step 4: Simplify right side
    1,239,582.80x = 1,602,165,479,414.64
  5. Step 5: Solve for x
    x = 1,602,165,479,414.64/1,239,582.80
  6. Step 6: Final answer
    x = 1,292,503.80

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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.