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Finding the Fourth Proportional to 875.86, 1,313.98 and 259.58

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Solution

The fourth proportional to 875.86, 1,313.98 and 259.58 is: 389.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.86 : 1,313.98 = 259.58 : x
  2. Step 2: Convert to fraction form
    875.86/1,313.98 = 259.58/x
  3. Step 3: Cross multiply
    875.86x = 1,313.98 × 259.58
  4. Step 4: Simplify right side
    875.86x = 341,082.93
  5. Step 5: Solve for x
    x = 341,082.93/875.86
  6. Step 6: Final answer
    x = 389.43

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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.