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Finding the Fourth Proportional to 875.68, 1,313.06 and 259.30

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Solution

The fourth proportional to 875.68, 1,313.06 and 259.30 is: 388.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.68 : 1,313.06 = 259.30 : x
  2. Step 2: Convert to fraction form
    875.68/1,313.06 = 259.30/x
  3. Step 3: Cross multiply
    875.68x = 1,313.06 × 259.30
  4. Step 4: Simplify right side
    875.68x = 340,472.53
  5. Step 5: Solve for x
    x = 340,472.53/875.68
  6. Step 6: Final answer
    x = 388.81

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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.