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Finding the Fourth Proportional to 1,225.89, 1,691.76 and 930.64

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Solution

The fourth proportional to 1,225.89, 1,691.76 and 930.64 is: 1,284.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.89 : 1,691.76 = 930.64 : x
  2. Step 2: Convert to fraction form
    1,225.89/1,691.76 = 930.64/x
  3. Step 3: Cross multiply
    1,225.89x = 1,691.76 × 930.64
  4. Step 4: Simplify right side
    1,225.89x = 1,574,419.53
  5. Step 5: Solve for x
    x = 1,574,419.53/1,225.89
  6. Step 6: Final answer
    x = 1,284.31

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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.