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Finding the Fourth Proportional to 877.22, 1,210.30 and 680.40

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Solution

The fourth proportional to 877.22, 1,210.30 and 680.40 is: 938.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.22 : 1,210.30 = 680.40 : x
  2. Step 2: Convert to fraction form
    877.22/1,210.30 = 680.40/x
  3. Step 3: Cross multiply
    877.22x = 1,210.30 × 680.40
  4. Step 4: Simplify right side
    877.22x = 823,488.12
  5. Step 5: Solve for x
    x = 823,488.12/877.22
  6. Step 6: Final answer
    x = 938.75

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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.