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Finding the Fourth Proportional to 1,172.16, 1,614.96 and 891.60

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Solution

The fourth proportional to 1,172.16, 1,614.96 and 891.60 is: 1,228.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.16 : 1,614.96 = 891.60 : x
  2. Step 2: Convert to fraction form
    1,172.16/1,614.96 = 891.60/x
  3. Step 3: Cross multiply
    1,172.16x = 1,614.96 × 891.60
  4. Step 4: Simplify right side
    1,172.16x = 1,439,898.34
  5. Step 5: Solve for x
    x = 1,439,898.34/1,172.16
  6. Step 6: Final answer
    x = 1,228.41

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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.