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Finding the Fourth Proportional to 1,279,728.92, 1,766,038 and 728,417.70

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Solution

The fourth proportional to 1,279,728.92, 1,766,038 and 728,417.70 is: 1,005,223.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279,728.92 : 1,766,038 = 728,417.70 : x
  2. Step 2: Convert to fraction form
    1,279,728.92/1,766,038 = 728,417.70/x
  3. Step 3: Cross multiply
    1,279,728.92x = 1,766,038 × 728,417.70
  4. Step 4: Simplify right side
    1,279,728.92x = 1,286,413,338,072.60
  5. Step 5: Solve for x
    x = 1,286,413,338,072.60/1,279,728.92
  6. Step 6: Final answer
    x = 1,005,223.31

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1.5x scale

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.