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Finding the Fourth Proportional to 949.76, 1,421.76 and 877.76

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Solution

The fourth proportional to 949.76, 1,421.76 and 877.76 is: 1,313.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.76 : 1,421.76 = 877.76 : x
  2. Step 2: Convert to fraction form
    949.76/1,421.76 = 877.76/x
  3. Step 3: Cross multiply
    949.76x = 1,421.76 × 877.76
  4. Step 4: Simplify right side
    949.76x = 1,247,964.06
  5. Step 5: Solve for x
    x = 1,247,964.06/949.76
  6. Step 6: Final answer
    x = 1,313.98

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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.