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Finding the Fourth Proportional to 691.84, 955.56 and 561.52

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Solution

The fourth proportional to 691.84, 955.56 and 561.52 is: 775.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.84 : 955.56 = 561.52 : x
  2. Step 2: Convert to fraction form
    691.84/955.56 = 561.52/x
  3. Step 3: Cross multiply
    691.84x = 955.56 × 561.52
  4. Step 4: Simplify right side
    691.84x = 536,566.05
  5. Step 5: Solve for x
    x = 536,566.05/691.84
  6. Step 6: Final answer
    x = 775.56

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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.