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Finding the Fourth Proportional to 995.79, 1,374.20 and 553.74

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Solution

The fourth proportional to 995.79, 1,374.20 and 553.74 is: 764.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.79 : 1,374.20 = 553.74 : x
  2. Step 2: Convert to fraction form
    995.79/1,374.20 = 553.74/x
  3. Step 3: Cross multiply
    995.79x = 1,374.20 × 553.74
  4. Step 4: Simplify right side
    995.79x = 760,946.74
  5. Step 5: Solve for x
    x = 760,946.74/995.79
  6. Step 6: Final answer
    x = 764.16

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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.