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Finding the Fourth Proportional to 877.87, 1,211.49 and 484.88

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Solution

The fourth proportional to 877.87, 1,211.49 and 484.88 is: 669.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.87 : 1,211.49 = 484.88 : x
  2. Step 2: Convert to fraction form
    877.87/1,211.49 = 484.88/x
  3. Step 3: Cross multiply
    877.87x = 1,211.49 × 484.88
  4. Step 4: Simplify right side
    877.87x = 587,430.30
  5. Step 5: Solve for x
    x = 587,430.30/877.87
  6. Step 6: Final answer
    x = 669.16

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1.5x scale

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.