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Finding the Fourth Proportional to 645.76, 969.72 and 549.10

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Solution

The fourth proportional to 645.76, 969.72 and 549.10 is: 824.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.76 : 969.72 = 549.10 : x
  2. Step 2: Convert to fraction form
    645.76/969.72 = 549.10/x
  3. Step 3: Cross multiply
    645.76x = 969.72 × 549.10
  4. Step 4: Simplify right side
    645.76x = 532,473.25
  5. Step 5: Solve for x
    x = 532,473.25/645.76
  6. Step 6: Final answer
    x = 824.57

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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.