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Finding the Fourth Proportional to 707.72, 1,061.64 and 187.80

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Solution

The fourth proportional to 707.72, 1,061.64 and 187.80 is: 281.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.72 : 1,061.64 = 187.80 : x
  2. Step 2: Convert to fraction form
    707.72/1,061.64 = 187.80/x
  3. Step 3: Cross multiply
    707.72x = 1,061.64 × 187.80
  4. Step 4: Simplify right side
    707.72x = 199,375.99
  5. Step 5: Solve for x
    x = 199,375.99/707.72
  6. Step 6: Final answer
    x = 281.72

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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.