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Finding the Fourth Proportional to 875.34, 1,311.12 and 835.20

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Solution

The fourth proportional to 875.34, 1,311.12 and 835.20 is: 1,251.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.34 : 1,311.12 = 835.20 : x
  2. Step 2: Convert to fraction form
    875.34/1,311.12 = 835.20/x
  3. Step 3: Cross multiply
    875.34x = 1,311.12 × 835.20
  4. Step 4: Simplify right side
    875.34x = 1,095,047.42
  5. Step 5: Solve for x
    x = 1,095,047.42/875.34
  6. Step 6: Final answer
    x = 1,251.00

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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.