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Finding the Fourth Proportional to 877.88, 1,211.68 and 505.08

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Solution

The fourth proportional to 877.88, 1,211.68 and 505.08 is: 697.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.88 : 1,211.68 = 505.08 : x
  2. Step 2: Convert to fraction form
    877.88/1,211.68 = 505.08/x
  3. Step 3: Cross multiply
    877.88x = 1,211.68 × 505.08
  4. Step 4: Simplify right side
    877.88x = 611,995.33
  5. Step 5: Solve for x
    x = 611,995.33/877.88
  6. Step 6: Final answer
    x = 697.13

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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.