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Finding the Fourth Proportional to 1,248,378.78, 1,721,194.26 and 1,018,702.78

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Solution

The fourth proportional to 1,248,378.78, 1,721,194.26 and 1,018,702.78 is: 1,404,529.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248,378.78 : 1,721,194.26 = 1,018,702.78 : x
  2. Step 2: Convert to fraction form
    1,248,378.78/1,721,194.26 = 1,018,702.78/x
  3. Step 3: Cross multiply
    1,248,378.78x = 1,721,194.26 × 1,018,702.78
  4. Step 4: Simplify right side
    1,248,378.78x = 1,753,385,375,189.13
  5. Step 5: Solve for x
    x = 1,753,385,375,189.13/1,248,378.78
  6. Step 6: Final answer
    x = 1,404,529.94

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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.