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Finding the Fourth Proportional to 873.84, 1,310.76 and 257.55

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Solution

The fourth proportional to 873.84, 1,310.76 and 257.55 is: 386.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.84 : 1,310.76 = 257.55 : x
  2. Step 2: Convert to fraction form
    873.84/1,310.76 = 257.55/x
  3. Step 3: Cross multiply
    873.84x = 1,310.76 × 257.55
  4. Step 4: Simplify right side
    873.84x = 337,578.40
  5. Step 5: Solve for x
    x = 337,578.40/873.84
  6. Step 6: Final answer
    x = 386.32

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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.