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Finding the Fourth Proportional to 875.82, 1,311.57 and 509.70

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Solution

The fourth proportional to 875.82, 1,311.57 and 509.70 is: 763.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.82 : 1,311.57 = 509.70 : x
  2. Step 2: Convert to fraction form
    875.82/1,311.57 = 509.70/x
  3. Step 3: Cross multiply
    875.82x = 1,311.57 × 509.70
  4. Step 4: Simplify right side
    875.82x = 668,507.23
  5. Step 5: Solve for x
    x = 668,507.23/875.82
  6. Step 6: Final answer
    x = 763.29

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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.