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Finding the Fourth Proportional to 1,389,167.74, 1,916,443.11 and 815,949.46

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Solution

The fourth proportional to 1,389,167.74, 1,916,443.11 and 815,949.46 is: 1,125,652.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389,167.74 : 1,916,443.11 = 815,949.46 : x
  2. Step 2: Convert to fraction form
    1,389,167.74/1,916,443.11 = 815,949.46/x
  3. Step 3: Cross multiply
    1,389,167.74x = 1,916,443.11 × 815,949.46
  4. Step 4: Simplify right side
    1,389,167.74x = 1,563,720,720,725.22
  5. Step 5: Solve for x
    x = 1,563,720,720,725.22/1,389,167.74
  6. Step 6: Final answer
    x = 1,125,652.92

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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.