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Finding the Fourth Proportional to 671.74, 1,002.60 and 655.34

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Solution

The fourth proportional to 671.74, 1,002.60 and 655.34 is: 978.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.74 : 1,002.60 = 655.34 : x
  2. Step 2: Convert to fraction form
    671.74/1,002.60 = 655.34/x
  3. Step 3: Cross multiply
    671.74x = 1,002.60 × 655.34
  4. Step 4: Simplify right side
    671.74x = 657,038.87
  5. Step 5: Solve for x
    x = 657,038.87/671.74
  6. Step 6: Final answer
    x = 978.12

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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.