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Finding the Fourth Proportional to 1,270.50, 1,904.45 and 721.52

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Solution

The fourth proportional to 1,270.50, 1,904.45 and 721.52 is: 1,081.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.50 : 1,904.45 = 721.52 : x
  2. Step 2: Convert to fraction form
    1,270.50/1,904.45 = 721.52/x
  3. Step 3: Cross multiply
    1,270.50x = 1,904.45 × 721.52
  4. Step 4: Simplify right side
    1,270.50x = 1,374,095.16
  5. Step 5: Solve for x
    x = 1,374,095.16/1,270.50
  6. Step 6: Final answer
    x = 1,081.54

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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.