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Finding the Fourth Proportional to 459.12, 689.76 and 387.84

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Solution

The fourth proportional to 459.12, 689.76 and 387.84 is: 582.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.12 : 689.76 = 387.84 : x
  2. Step 2: Convert to fraction form
    459.12/689.76 = 387.84/x
  3. Step 3: Cross multiply
    459.12x = 689.76 × 387.84
  4. Step 4: Simplify right side
    459.12x = 267,516.52
  5. Step 5: Solve for x
    x = 267,516.52/459.12
  6. Step 6: Final answer
    x = 582.67

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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.