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Finding the Fourth Proportional to 881.34, 1,215.51 and 715.50

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Solution

The fourth proportional to 881.34, 1,215.51 and 715.50 is: 986.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.34 : 1,215.51 = 715.50 : x
  2. Step 2: Convert to fraction form
    881.34/1,215.51 = 715.50/x
  3. Step 3: Cross multiply
    881.34x = 1,215.51 × 715.50
  4. Step 4: Simplify right side
    881.34x = 869,697.41
  5. Step 5: Solve for x
    x = 869,697.41/881.34
  6. Step 6: Final answer
    x = 986.79

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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.