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Finding the Fourth Proportional to 459.59, 689.61 and 185.72

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Solution

The fourth proportional to 459.59, 689.61 and 185.72 is: 278.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.59 : 689.61 = 185.72 : x
  2. Step 2: Convert to fraction form
    459.59/689.61 = 185.72/x
  3. Step 3: Cross multiply
    459.59x = 689.61 × 185.72
  4. Step 4: Simplify right side
    459.59x = 128,074.37
  5. Step 5: Solve for x
    x = 128,074.37/459.59
  6. Step 6: Final answer
    x = 278.67

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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.