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Finding the Fourth Proportional to 1,248.07, 1,722.03 and 805.89

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Solution

The fourth proportional to 1,248.07, 1,722.03 and 805.89 is: 1,111.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.07 : 1,722.03 = 805.89 : x
  2. Step 2: Convert to fraction form
    1,248.07/1,722.03 = 805.89/x
  3. Step 3: Cross multiply
    1,248.07x = 1,722.03 × 805.89
  4. Step 4: Simplify right side
    1,248.07x = 1,387,766.76
  5. Step 5: Solve for x
    x = 1,387,766.76/1,248.07
  6. Step 6: Final answer
    x = 1,111.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.