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Finding the Fourth Proportional to 880.89, 1,215.71 and 487.99

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Solution

The fourth proportional to 880.89, 1,215.71 and 487.99 is: 673.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.89 : 1,215.71 = 487.99 : x
  2. Step 2: Convert to fraction form
    880.89/1,215.71 = 487.99/x
  3. Step 3: Cross multiply
    880.89x = 1,215.71 × 487.99
  4. Step 4: Simplify right side
    880.89x = 593,245.80
  5. Step 5: Solve for x
    x = 593,245.80/880.89
  6. Step 6: Final answer
    x = 673.46

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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.