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Finding the Fourth Proportional to 877.40, 1,211.06 and 615.48

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Solution

The fourth proportional to 877.40, 1,211.06 and 615.48 is: 849.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.40 : 1,211.06 = 615.48 : x
  2. Step 2: Convert to fraction form
    877.40/1,211.06 = 615.48/x
  3. Step 3: Cross multiply
    877.40x = 1,211.06 × 615.48
  4. Step 4: Simplify right side
    877.40x = 745,383.21
  5. Step 5: Solve for x
    x = 745,383.21/877.40
  6. Step 6: Final answer
    x = 849.54

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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.