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Finding the Fourth Proportional to 280.10, 420.19 and 243.16

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Solution

The fourth proportional to 280.10, 420.19 and 243.16 is: 364.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.10 : 420.19 = 243.16 : x
  2. Step 2: Convert to fraction form
    280.10/420.19 = 243.16/x
  3. Step 3: Cross multiply
    280.10x = 420.19 × 243.16
  4. Step 4: Simplify right side
    280.10x = 102,173.40
  5. Step 5: Solve for x
    x = 102,173.40/280.10
  6. Step 6: Final answer
    x = 364.77

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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.