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Finding the Fourth Proportional to 922.56, 1,274.40 and 916.08

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Solution

The fourth proportional to 922.56, 1,274.40 and 916.08 is: 1,265.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.56 : 1,274.40 = 916.08 : x
  2. Step 2: Convert to fraction form
    922.56/1,274.40 = 916.08/x
  3. Step 3: Cross multiply
    922.56x = 1,274.40 × 916.08
  4. Step 4: Simplify right side
    922.56x = 1,167,452.35
  5. Step 5: Solve for x
    x = 1,167,452.35/922.56
  6. Step 6: Final answer
    x = 1,265.45

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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.