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Finding the Fourth Proportional to 992,812.60, 1,489,218.90 and 728,428.60

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Solution

The fourth proportional to 992,812.60, 1,489,218.90 and 728,428.60 is: 1,092,642.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    992,812.60 : 1,489,218.90 = 728,428.60 : x
  2. Step 2: Convert to fraction form
    992,812.60/1,489,218.90 = 728,428.60/x
  3. Step 3: Cross multiply
    992,812.60x = 1,489,218.90 × 728,428.60
  4. Step 4: Simplify right side
    992,812.60x = 1,084,789,638,420.54
  5. Step 5: Solve for x
    x = 1,084,789,638,420.54/992,812.60
  6. Step 6: Final answer
    x = 1,092,642.90

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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.