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Finding the Fourth Proportional to 820,842.90, 1,231,264.35 and 803,346.90

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Solution

The fourth proportional to 820,842.90, 1,231,264.35 and 803,346.90 is: 1,205,020.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,842.90 : 1,231,264.35 = 803,346.90 : x
  2. Step 2: Convert to fraction form
    820,842.90/1,231,264.35 = 803,346.90/x
  3. Step 3: Cross multiply
    820,842.90x = 1,231,264.35 × 803,346.90
  4. Step 4: Simplify right side
    820,842.90x = 989,132,398,653.02
  5. Step 5: Solve for x
    x = 989,132,398,653.02/820,842.90
  6. Step 6: Final answer
    x = 1,205,020.35

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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.