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Finding the Fourth Proportional to 887.21, 1,331.51 and 615.21

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Solution

The fourth proportional to 887.21, 1,331.51 and 615.21 is: 923.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.21 : 1,331.51 = 615.21 : x
  2. Step 2: Convert to fraction form
    887.21/1,331.51 = 615.21/x
  3. Step 3: Cross multiply
    887.21x = 1,331.51 × 615.21
  4. Step 4: Simplify right side
    887.21x = 819,155.19
  5. Step 5: Solve for x
    x = 819,155.19/887.21
  6. Step 6: Final answer
    x = 923.30

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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.