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Finding the Fourth Proportional to 878.76, 1,315.89 and 507.56

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Solution

The fourth proportional to 878.76, 1,315.89 and 507.56 is: 760.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.76 : 1,315.89 = 507.56 : x
  2. Step 2: Convert to fraction form
    878.76/1,315.89 = 507.56/x
  3. Step 3: Cross multiply
    878.76x = 1,315.89 × 507.56
  4. Step 4: Simplify right side
    878.76x = 667,886.55
  5. Step 5: Solve for x
    x = 667,886.55/878.76
  6. Step 6: Final answer
    x = 760.03

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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.