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Finding the Fourth Proportional to 989,759.90, 1,485,689.68 and 876,642.03

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Solution

The fourth proportional to 989,759.90, 1,485,689.68 and 876,642.03 is: 1,315,892.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    989,759.90 : 1,485,689.68 = 876,642.03 : x
  2. Step 2: Convert to fraction form
    989,759.90/1,485,689.68 = 876,642.03/x
  3. Step 3: Cross multiply
    989,759.90x = 1,485,689.68 × 876,642.03
  4. Step 4: Simplify right side
    989,759.90x = 1,302,418,017,025.25
  5. Step 5: Solve for x
    x = 1,302,418,017,025.25/989,759.90
  6. Step 6: Final answer
    x = 1,315,892.89

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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.