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Finding the Fourth Proportional to 988.16, 1,360.86 and 985.20

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Solution

The fourth proportional to 988.16, 1,360.86 and 985.20 is: 1,356.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.16 : 1,360.86 = 985.20 : x
  2. Step 2: Convert to fraction form
    988.16/1,360.86 = 985.20/x
  3. Step 3: Cross multiply
    988.16x = 1,360.86 × 985.20
  4. Step 4: Simplify right side
    988.16x = 1,340,719.27
  5. Step 5: Solve for x
    x = 1,340,719.27/988.16
  6. Step 6: Final answer
    x = 1,356.78

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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.