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Finding the Fourth Proportional to 876.18, 1,314.15 and 259.86

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Solution

The fourth proportional to 876.18, 1,314.15 and 259.86 is: 389.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.18 : 1,314.15 = 259.86 : x
  2. Step 2: Convert to fraction form
    876.18/1,314.15 = 259.86/x
  3. Step 3: Cross multiply
    876.18x = 1,314.15 × 259.86
  4. Step 4: Simplify right side
    876.18x = 341,495.02
  5. Step 5: Solve for x
    x = 341,495.02/876.18
  6. Step 6: Final answer
    x = 389.75

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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.