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Finding the Fourth Proportional to 1,097.60, 1,512.96 and 864.32

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Solution

The fourth proportional to 1,097.60, 1,512.96 and 864.32 is: 1,191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,097.60 : 1,512.96 = 864.32 : x
  2. Step 2: Convert to fraction form
    1,097.60/1,512.96 = 864.32/x
  3. Step 3: Cross multiply
    1,097.60x = 1,512.96 × 864.32
  4. Step 4: Simplify right side
    1,097.60x = 1,307,681.59
  5. Step 5: Solve for x
    x = 1,307,681.59/1,097.60
  6. Step 6: Final answer
    x = 1,191.40

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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.