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Finding the Fourth Proportional to 815,999.60, 1,223,999.40 and 725,020.40

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Solution

The fourth proportional to 815,999.60, 1,223,999.40 and 725,020.40 is: 1,087,530.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,999.60 : 1,223,999.40 = 725,020.40 : x
  2. Step 2: Convert to fraction form
    815,999.60/1,223,999.40 = 725,020.40/x
  3. Step 3: Cross multiply
    815,999.60x = 1,223,999.40 × 725,020.40
  4. Step 4: Simplify right side
    815,999.60x = 887,424,534,587.76
  5. Step 5: Solve for x
    x = 887,424,534,587.76/815,999.60
  6. Step 6: Final answer
    x = 1,087,530.60

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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.