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Finding the Fourth Proportional to 989,728.30, 1,389,352.10 and 989,728.30

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Solution

The fourth proportional to 989,728.30, 1,389,352.10 and 989,728.30 is: 1,389,352.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    989,728.30 : 1,389,352.10 = 989,728.30 : x
  2. Step 2: Convert to fraction form
    989,728.30/1,389,352.10 = 989,728.30/x
  3. Step 3: Cross multiply
    989,728.30x = 1,389,352.10 × 989,728.30
  4. Step 4: Simplify right side
    989,728.30x = 1,375,081,092,034.43
  5. Step 5: Solve for x
    x = 1,375,081,092,034.43/989,728.30
  6. Step 6: Final answer
    x = 1,389,352.10

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.