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Finding the Fourth Proportional to 877.28, 1,211.16 and 680.36

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Solution

The fourth proportional to 877.28, 1,211.16 and 680.36 is: 939.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.28 : 1,211.16 = 680.36 : x
  2. Step 2: Convert to fraction form
    877.28/1,211.16 = 680.36/x
  3. Step 3: Cross multiply
    877.28x = 1,211.16 × 680.36
  4. Step 4: Simplify right side
    877.28x = 824,024.82
  5. Step 5: Solve for x
    x = 824,024.82/877.28
  6. Step 6: Final answer
    x = 939.30

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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.