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Finding the Fourth Proportional to 420.36, 630 and 189.24

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Solution

The fourth proportional to 420.36, 630 and 189.24 is: 283.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.36 : 630 = 189.24 : x
  2. Step 2: Convert to fraction form
    420.36/630 = 189.24/x
  3. Step 3: Cross multiply
    420.36x = 630 × 189.24
  4. Step 4: Simplify right side
    420.36x = 119,221.20
  5. Step 5: Solve for x
    x = 119,221.20/420.36
  6. Step 6: Final answer
    x = 283.62

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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.