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Finding the Fourth Proportional to 901.32, 1,349.88 and 782.68

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Solution

The fourth proportional to 901.32, 1,349.88 and 782.68 is: 1,172.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    901.32 : 1,349.88 = 782.68 : x
  2. Step 2: Convert to fraction form
    901.32/1,349.88 = 782.68/x
  3. Step 3: Cross multiply
    901.32x = 1,349.88 × 782.68
  4. Step 4: Simplify right side
    901.32x = 1,056,524.08
  5. Step 5: Solve for x
    x = 1,056,524.08/901.32
  6. Step 6: Final answer
    x = 1,172.20

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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.