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Finding the Fourth Proportional to 875.70, 1,314.09 and 389.16

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Solution

The fourth proportional to 875.70, 1,314.09 and 389.16 is: 583.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.70 : 1,314.09 = 389.16 : x
  2. Step 2: Convert to fraction form
    875.70/1,314.09 = 389.16/x
  3. Step 3: Cross multiply
    875.70x = 1,314.09 × 389.16
  4. Step 4: Simplify right side
    875.70x = 511,391.26
  5. Step 5: Solve for x
    x = 511,391.26/875.70
  6. Step 6: Final answer
    x = 583.98

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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.