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Finding the Fourth Proportional to 995.70, 1,374.08 and 553.59

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Solution

The fourth proportional to 995.70, 1,374.08 and 553.59 is: 763.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.70 : 1,374.08 = 553.59 : x
  2. Step 2: Convert to fraction form
    995.70/1,374.08 = 553.59/x
  3. Step 3: Cross multiply
    995.70x = 1,374.08 × 553.59
  4. Step 4: Simplify right side
    995.70x = 760,674.18
  5. Step 5: Solve for x
    x = 760,674.18/995.70
  6. Step 6: Final answer
    x = 763.96

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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.