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Finding the Fourth Proportional to 875.42, 1,311.41 and 509.44

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Solution

The fourth proportional to 875.42, 1,311.41 and 509.44 is: 763.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.42 : 1,311.41 = 509.44 : x
  2. Step 2: Convert to fraction form
    875.42/1,311.41 = 509.44/x
  3. Step 3: Cross multiply
    875.42x = 1,311.41 × 509.44
  4. Step 4: Simplify right side
    875.42x = 668,084.71
  5. Step 5: Solve for x
    x = 668,084.71/875.42
  6. Step 6: Final answer
    x = 763.16

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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.