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Finding the Fourth Proportional to 995.24, 1,373.28 and 553.11

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Solution

The fourth proportional to 995.24, 1,373.28 and 553.11 is: 763.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.24 : 1,373.28 = 553.11 : x
  2. Step 2: Convert to fraction form
    995.24/1,373.28 = 553.11/x
  3. Step 3: Cross multiply
    995.24x = 1,373.28 × 553.11
  4. Step 4: Simplify right side
    995.24x = 759,574.90
  5. Step 5: Solve for x
    x = 759,574.90/995.24
  6. Step 6: Final answer
    x = 763.21

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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.