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Finding the Fourth Proportional to 720.93, 1,081.42 and 258.74

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Solution

The fourth proportional to 720.93, 1,081.42 and 258.74 is: 388.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.93 : 1,081.42 = 258.74 : x
  2. Step 2: Convert to fraction form
    720.93/1,081.42 = 258.74/x
  3. Step 3: Cross multiply
    720.93x = 1,081.42 × 258.74
  4. Step 4: Simplify right side
    720.93x = 279,806.61
  5. Step 5: Solve for x
    x = 279,806.61/720.93
  6. Step 6: Final answer
    x = 388.12

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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.