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Finding the Fourth Proportional to 995.72, 1,492.12 and 722.40

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Solution

The fourth proportional to 995.72, 1,492.12 and 722.40 is: 1,082.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.72 : 1,492.12 = 722.40 : x
  2. Step 2: Convert to fraction form
    995.72/1,492.12 = 722.40/x
  3. Step 3: Cross multiply
    995.72x = 1,492.12 × 722.40
  4. Step 4: Simplify right side
    995.72x = 1,077,907.49
  5. Step 5: Solve for x
    x = 1,077,907.49/995.72
  6. Step 6: Final answer
    x = 1,082.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.