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Finding the Fourth Proportional to 1,239.35, 1,859.29 and 508.99

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Solution

The fourth proportional to 1,239.35, 1,859.29 and 508.99 is: 763.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.35 : 1,859.29 = 508.99 : x
  2. Step 2: Convert to fraction form
    1,239.35/1,859.29 = 508.99/x
  3. Step 3: Cross multiply
    1,239.35x = 1,859.29 × 508.99
  4. Step 4: Simplify right side
    1,239.35x = 946,361.07
  5. Step 5: Solve for x
    x = 946,361.07/1,239.35
  6. Step 6: Final answer
    x = 763.59

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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.