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Finding the Fourth Proportional to 921.26, 1,381.88 and 875.12

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Solution

The fourth proportional to 921.26, 1,381.88 and 875.12 is: 1,312.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.26 : 1,381.88 = 875.12 : x
  2. Step 2: Convert to fraction form
    921.26/1,381.88 = 875.12/x
  3. Step 3: Cross multiply
    921.26x = 1,381.88 × 875.12
  4. Step 4: Simplify right side
    921.26x = 1,209,310.83
  5. Step 5: Solve for x
    x = 1,209,310.83/921.26
  6. Step 6: Final answer
    x = 1,312.67

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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.