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Finding the Fourth Proportional to 487.46, 672.60 and 290.99

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Solution

The fourth proportional to 487.46, 672.60 and 290.99 is: 401.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.46 : 672.60 = 290.99 : x
  2. Step 2: Convert to fraction form
    487.46/672.60 = 290.99/x
  3. Step 3: Cross multiply
    487.46x = 672.60 × 290.99
  4. Step 4: Simplify right side
    487.46x = 195,715.06
  5. Step 5: Solve for x
    x = 195,715.06/487.46
  6. Step 6: Final answer
    x = 401.50

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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.