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Finding the Fourth Proportional to 966.15, 1,439.28 and 918.63

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Solution

The fourth proportional to 966.15, 1,439.28 and 918.63 is: 1,368.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    966.15 : 1,439.28 = 918.63 : x
  2. Step 2: Convert to fraction form
    966.15/1,439.28 = 918.63/x
  3. Step 3: Cross multiply
    966.15x = 1,439.28 × 918.63
  4. Step 4: Simplify right side
    966.15x = 1,322,165.79
  5. Step 5: Solve for x
    x = 1,322,165.79/966.15
  6. Step 6: Final answer
    x = 1,368.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.