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Finding the Fourth Proportional to 1,239.47, 1,859.46 and 509.03

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Solution

The fourth proportional to 1,239.47, 1,859.46 and 509.03 is: 763.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.47 : 1,859.46 = 509.03 : x
  2. Step 2: Convert to fraction form
    1,239.47/1,859.46 = 509.03/x
  3. Step 3: Cross multiply
    1,239.47x = 1,859.46 × 509.03
  4. Step 4: Simplify right side
    1,239.47x = 946,520.92
  5. Step 5: Solve for x
    x = 946,520.92/1,239.47
  6. Step 6: Final answer
    x = 763.65

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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.