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Finding the Fourth Proportional to 964.79, 1,447.18 and 387.67

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Solution

The fourth proportional to 964.79, 1,447.18 and 387.67 is: 581.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    964.79 : 1,447.18 = 387.67 : x
  2. Step 2: Convert to fraction form
    964.79/1,447.18 = 387.67/x
  3. Step 3: Cross multiply
    964.79x = 1,447.18 × 387.67
  4. Step 4: Simplify right side
    964.79x = 561,023.68
  5. Step 5: Solve for x
    x = 561,023.68/964.79
  6. Step 6: Final answer
    x = 581.50

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Double scale
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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.