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Finding the Fourth Proportional to 875.80, 1,313.70 and 259.45

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Solution

The fourth proportional to 875.80, 1,313.70 and 259.45 is: 389.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.80 : 1,313.70 = 259.45 : x
  2. Step 2: Convert to fraction form
    875.80/1,313.70 = 259.45/x
  3. Step 3: Cross multiply
    875.80x = 1,313.70 × 259.45
  4. Step 4: Simplify right side
    875.80x = 340,839.47
  5. Step 5: Solve for x
    x = 340,839.47/875.80
  6. Step 6: Final answer
    x = 389.18

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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.