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Finding the Fourth Proportional to 445.99, 615.75 and 288.70

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Solution

The fourth proportional to 445.99, 615.75 and 288.70 is: 398.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.99 : 615.75 = 288.70 : x
  2. Step 2: Convert to fraction form
    445.99/615.75 = 288.70/x
  3. Step 3: Cross multiply
    445.99x = 615.75 × 288.70
  4. Step 4: Simplify right side
    445.99x = 177,762.50
  5. Step 5: Solve for x
    x = 177,762.50/445.99
  6. Step 6: Final answer
    x = 398.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.