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Finding the Fourth Proportional to 916.40, 1,374.60 and 871.60

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Solution

The fourth proportional to 916.40, 1,374.60 and 871.60 is: 1,307.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.40 : 1,374.60 = 871.60 : x
  2. Step 2: Convert to fraction form
    916.40/1,374.60 = 871.60/x
  3. Step 3: Cross multiply
    916.40x = 1,374.60 × 871.60
  4. Step 4: Simplify right side
    916.40x = 1,198,101.36
  5. Step 5: Solve for x
    x = 1,198,101.36/916.40
  6. Step 6: Final answer
    x = 1,307.40

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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.