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Finding the Fourth Proportional to 832.10, 1,242.89 and 647.57

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Solution

The fourth proportional to 832.10, 1,242.89 and 647.57 is: 967.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.10 : 1,242.89 = 647.57 : x
  2. Step 2: Convert to fraction form
    832.10/1,242.89 = 647.57/x
  3. Step 3: Cross multiply
    832.10x = 1,242.89 × 647.57
  4. Step 4: Simplify right side
    832.10x = 804,858.28
  5. Step 5: Solve for x
    x = 804,858.28/832.10
  6. Step 6: Final answer
    x = 967.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.