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Finding the Fourth Proportional to 875.98, 1,313.05 and 389.37

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Solution

The fourth proportional to 875.98, 1,313.05 and 389.37 is: 583.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.98 : 1,313.05 = 389.37 : x
  2. Step 2: Convert to fraction form
    875.98/1,313.05 = 389.37/x
  3. Step 3: Cross multiply
    875.98x = 1,313.05 × 389.37
  4. Step 4: Simplify right side
    875.98x = 511,262.28
  5. Step 5: Solve for x
    x = 511,262.28/875.98
  6. Step 6: Final answer
    x = 583.65

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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.