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Finding the Fourth Proportional to 837.50, 1,155.75 and 488.40

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Solution

The fourth proportional to 837.50, 1,155.75 and 488.40 is: 673.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    837.50 : 1,155.75 = 488.40 : x
  2. Step 2: Convert to fraction form
    837.50/1,155.75 = 488.40/x
  3. Step 3: Cross multiply
    837.50x = 1,155.75 × 488.40
  4. Step 4: Simplify right side
    837.50x = 564,468.30
  5. Step 5: Solve for x
    x = 564,468.30/837.50
  6. Step 6: Final answer
    x = 673.99

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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.