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Finding the Fourth Proportional to 887.60, 1,224.36 and 690.80

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Solution

The fourth proportional to 887.60, 1,224.36 and 690.80 is: 952.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.60 : 1,224.36 = 690.80 : x
  2. Step 2: Convert to fraction form
    887.60/1,224.36 = 690.80/x
  3. Step 3: Cross multiply
    887.60x = 1,224.36 × 690.80
  4. Step 4: Simplify right side
    887.60x = 845,787.89
  5. Step 5: Solve for x
    x = 845,787.89/887.60
  6. Step 6: Final answer
    x = 952.89

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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.