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Finding the Fourth Proportional to 643.08, 886.70 and 549.52

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Solution

The fourth proportional to 643.08, 886.70 and 549.52 is: 757.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.08 : 886.70 = 549.52 : x
  2. Step 2: Convert to fraction form
    643.08/886.70 = 549.52/x
  3. Step 3: Cross multiply
    643.08x = 886.70 × 549.52
  4. Step 4: Simplify right side
    643.08x = 487,259.38
  5. Step 5: Solve for x
    x = 487,259.38/643.08
  6. Step 6: Final answer
    x = 757.70

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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.