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Finding the Fourth Proportional to 877.84, 1,318.13 and 838.89

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Solution

The fourth proportional to 877.84, 1,318.13 and 838.89 is: 1,259.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.84 : 1,318.13 = 838.89 : x
  2. Step 2: Convert to fraction form
    877.84/1,318.13 = 838.89/x
  3. Step 3: Cross multiply
    877.84x = 1,318.13 × 838.89
  4. Step 4: Simplify right side
    877.84x = 1,105,766.08
  5. Step 5: Solve for x
    x = 1,105,766.08/877.84
  6. Step 6: Final answer
    x = 1,259.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.