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Finding the Fourth Proportional to 987.17, 1,362.54 and 561.92

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Solution

The fourth proportional to 987.17, 1,362.54 and 561.92 is: 775.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.17 : 1,362.54 = 561.92 : x
  2. Step 2: Convert to fraction form
    987.17/1,362.54 = 561.92/x
  3. Step 3: Cross multiply
    987.17x = 1,362.54 × 561.92
  4. Step 4: Simplify right side
    987.17x = 765,638.48
  5. Step 5: Solve for x
    x = 765,638.48/987.17
  6. Step 6: Final answer
    x = 775.59

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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.