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Finding the Fourth Proportional to 1,008.76, 1,513.60 and 912.16

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Solution

The fourth proportional to 1,008.76, 1,513.60 and 912.16 is: 1,368.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.76 : 1,513.60 = 912.16 : x
  2. Step 2: Convert to fraction form
    1,008.76/1,513.60 = 912.16/x
  3. Step 3: Cross multiply
    1,008.76x = 1,513.60 × 912.16
  4. Step 4: Simplify right side
    1,008.76x = 1,380,645.38
  5. Step 5: Solve for x
    x = 1,380,645.38/1,008.76
  6. Step 6: Final answer
    x = 1,368.66

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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.