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Finding the Fourth Proportional to 671.70, 1,007.55 and 618.90

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Solution

The fourth proportional to 671.70, 1,007.55 and 618.90 is: 928.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.70 : 1,007.55 = 618.90 : x
  2. Step 2: Convert to fraction form
    671.70/1,007.55 = 618.90/x
  3. Step 3: Cross multiply
    671.70x = 1,007.55 × 618.90
  4. Step 4: Simplify right side
    671.70x = 623,572.70
  5. Step 5: Solve for x
    x = 623,572.70/671.70
  6. Step 6: Final answer
    x = 928.35

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.