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Finding the Fourth Proportional to 456.40, 684.72 and 148.24

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Solution

The fourth proportional to 456.40, 684.72 and 148.24 is: 222.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.40 : 684.72 = 148.24 : x
  2. Step 2: Convert to fraction form
    456.40/684.72 = 148.24/x
  3. Step 3: Cross multiply
    456.40x = 684.72 × 148.24
  4. Step 4: Simplify right side
    456.40x = 101,502.89
  5. Step 5: Solve for x
    x = 101,502.89/456.40
  6. Step 6: Final answer
    x = 222.40

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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.