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Finding the Fourth Proportional to 876.88, 1,211.64 and 703.60

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Solution

The fourth proportional to 876.88, 1,211.64 and 703.60 is: 972.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.88 : 1,211.64 = 703.60 : x
  2. Step 2: Convert to fraction form
    876.88/1,211.64 = 703.60/x
  3. Step 3: Cross multiply
    876.88x = 1,211.64 × 703.60
  4. Step 4: Simplify right side
    876.88x = 852,509.90
  5. Step 5: Solve for x
    x = 852,509.90/876.88
  6. Step 6: Final answer
    x = 972.21

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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.