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Finding the Fourth Proportional to 995.56, 1,373.82 and 553.40

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Solution

The fourth proportional to 995.56, 1,373.82 and 553.40 is: 763.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.56 : 1,373.82 = 553.40 : x
  2. Step 2: Convert to fraction form
    995.56/1,373.82 = 553.40/x
  3. Step 3: Cross multiply
    995.56x = 1,373.82 × 553.40
  4. Step 4: Simplify right side
    995.56x = 760,271.99
  5. Step 5: Solve for x
    x = 760,271.99/995.56
  6. Step 6: Final answer
    x = 763.66

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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.