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Finding the Fourth Proportional to 430.65, 646.38 and 235.74

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Solution

The fourth proportional to 430.65, 646.38 and 235.74 is: 353.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.65 : 646.38 = 235.74 : x
  2. Step 2: Convert to fraction form
    430.65/646.38 = 235.74/x
  3. Step 3: Cross multiply
    430.65x = 646.38 × 235.74
  4. Step 4: Simplify right side
    430.65x = 152,380.05
  5. Step 5: Solve for x
    x = 152,380.05/430.65
  6. Step 6: Final answer
    x = 353.84

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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.