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Finding the Fourth Proportional to 715.60, 988.72 and 561.52

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Solution

The fourth proportional to 715.60, 988.72 and 561.52 is: 775.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.60 : 988.72 = 561.52 : x
  2. Step 2: Convert to fraction form
    715.60/988.72 = 561.52/x
  3. Step 3: Cross multiply
    715.60x = 988.72 × 561.52
  4. Step 4: Simplify right side
    715.60x = 555,186.05
  5. Step 5: Solve for x
    x = 555,186.05/715.60
  6. Step 6: Final answer
    x = 775.83

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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.