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Finding the Fourth Proportional to 280.59, 420.74 and 118.05

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Solution

The fourth proportional to 280.59, 420.74 and 118.05 is: 177.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.59 : 420.74 = 118.05 : x
  2. Step 2: Convert to fraction form
    280.59/420.74 = 118.05/x
  3. Step 3: Cross multiply
    280.59x = 420.74 × 118.05
  4. Step 4: Simplify right side
    280.59x = 49,668.36
  5. Step 5: Solve for x
    x = 49,668.36/280.59
  6. Step 6: Final answer
    x = 177.01

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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.