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Finding the Fourth Proportional to 875.85, 1,313.85 and 259.55

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Solution

The fourth proportional to 875.85, 1,313.85 and 259.55 is: 389.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.85 : 1,313.85 = 259.55 : x
  2. Step 2: Convert to fraction form
    875.85/1,313.85 = 259.55/x
  3. Step 3: Cross multiply
    875.85x = 1,313.85 × 259.55
  4. Step 4: Simplify right side
    875.85x = 341,003.20
  5. Step 5: Solve for x
    x = 341,003.20/875.85
  6. Step 6: Final answer
    x = 389.34

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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.