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Finding the Fourth Proportional to 1,115.16, 1,530.68 and 988.04

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Solution

The fourth proportional to 1,115.16, 1,530.68 and 988.04 is: 1,356.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.16 : 1,530.68 = 988.04 : x
  2. Step 2: Convert to fraction form
    1,115.16/1,530.68 = 988.04/x
  3. Step 3: Cross multiply
    1,115.16x = 1,530.68 × 988.04
  4. Step 4: Simplify right side
    1,115.16x = 1,512,373.07
  5. Step 5: Solve for x
    x = 1,512,373.07/1,115.16
  6. Step 6: Final answer
    x = 1,356.19

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.