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Finding the Fourth Proportional to 868,625.40, 1,302,938.10 and 728,657.40

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Solution

The fourth proportional to 868,625.40, 1,302,938.10 and 728,657.40 is: 1,092,986.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    868,625.40 : 1,302,938.10 = 728,657.40 : x
  2. Step 2: Convert to fraction form
    868,625.40/1,302,938.10 = 728,657.40/x
  3. Step 3: Cross multiply
    868,625.40x = 1,302,938.10 × 728,657.40
  4. Step 4: Simplify right side
    868,625.40x = 949,395,488,306.94
  5. Step 5: Solve for x
    x = 949,395,488,306.94/868,625.40
  6. Step 6: Final answer
    x = 1,092,986.10

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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.