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Finding the Fourth Proportional to 875.34, 1,311.12 and 807.30

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Solution

The fourth proportional to 875.34, 1,311.12 and 807.30 is: 1,209.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.34 : 1,311.12 = 807.30 : x
  2. Step 2: Convert to fraction form
    875.34/1,311.12 = 807.30/x
  3. Step 3: Cross multiply
    875.34x = 1,311.12 × 807.30
  4. Step 4: Simplify right side
    875.34x = 1,058,467.18
  5. Step 5: Solve for x
    x = 1,058,467.18/875.34
  6. Step 6: Final answer
    x = 1,209.21

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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.