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Finding the Fourth Proportional to 879.75, 1,213.93 and 747.51

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Solution

The fourth proportional to 879.75, 1,213.93 and 747.51 is: 1,031.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.75 : 1,213.93 = 747.51 : x
  2. Step 2: Convert to fraction form
    879.75/1,213.93 = 747.51/x
  3. Step 3: Cross multiply
    879.75x = 1,213.93 × 747.51
  4. Step 4: Simplify right side
    879.75x = 907,421.20
  5. Step 5: Solve for x
    x = 907,421.20/879.75
  6. Step 6: Final answer
    x = 1,031.45

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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.