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Finding the Fourth Proportional to 509.61, 703.11 and 288.51

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Solution

The fourth proportional to 509.61, 703.11 and 288.51 is: 398.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    509.61 : 703.11 = 288.51 : x
  2. Step 2: Convert to fraction form
    509.61/703.11 = 288.51/x
  3. Step 3: Cross multiply
    509.61x = 703.11 × 288.51
  4. Step 4: Simplify right side
    509.61x = 202,854.27
  5. Step 5: Solve for x
    x = 202,854.27/509.61
  6. Step 6: Final answer
    x = 398.06

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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.