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Finding the Fourth Proportional to 879.68, 1,213.76 and 530.36

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Solution

The fourth proportional to 879.68, 1,213.76 and 530.36 is: 731.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.68 : 1,213.76 = 530.36 : x
  2. Step 2: Convert to fraction form
    879.68/1,213.76 = 530.36/x
  3. Step 3: Cross multiply
    879.68x = 1,213.76 × 530.36
  4. Step 4: Simplify right side
    879.68x = 643,725.01
  5. Step 5: Solve for x
    x = 643,725.01/879.68
  6. Step 6: Final answer
    x = 731.78

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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.