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Finding the Fourth Proportional to 653.78, 981.21 and 460.19

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Solution

The fourth proportional to 653.78, 981.21 and 460.19 is: 690.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.78 : 981.21 = 460.19 : x
  2. Step 2: Convert to fraction form
    653.78/981.21 = 460.19/x
  3. Step 3: Cross multiply
    653.78x = 981.21 × 460.19
  4. Step 4: Simplify right side
    653.78x = 451,543.03
  5. Step 5: Solve for x
    x = 451,543.03/653.78
  6. Step 6: Final answer
    x = 690.67

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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.