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Finding the Fourth Proportional to 891.40, 1,334.04 and 615.64

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Solution

The fourth proportional to 891.40, 1,334.04 and 615.64 is: 921.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.40 : 1,334.04 = 615.64 : x
  2. Step 2: Convert to fraction form
    891.40/1,334.04 = 615.64/x
  3. Step 3: Cross multiply
    891.40x = 1,334.04 × 615.64
  4. Step 4: Simplify right side
    891.40x = 821,288.39
  5. Step 5: Solve for x
    x = 821,288.39/891.40
  6. Step 6: Final answer
    x = 921.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.