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Finding the Fourth Proportional to 509.71, 703.33 and 288.61

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Solution

The fourth proportional to 509.71, 703.33 and 288.61 is: 398.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.71 : 703.33 = 288.61 : x
  2. Step 2: Convert to fraction form
    509.71/703.33 = 288.61/x
  3. Step 3: Cross multiply
    509.71x = 703.33 × 288.61
  4. Step 4: Simplify right side
    509.71x = 202,988.07
  5. Step 5: Solve for x
    x = 202,988.07/509.71
  6. Step 6: Final answer
    x = 398.24

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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.