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Finding the Fourth Proportional to 1,239.66, 1,859.45 and 509.72

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Solution

The fourth proportional to 1,239.66, 1,859.45 and 509.72 is: 764.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.66 : 1,859.45 = 509.72 : x
  2. Step 2: Convert to fraction form
    1,239.66/1,859.45 = 509.72/x
  3. Step 3: Cross multiply
    1,239.66x = 1,859.45 × 509.72
  4. Step 4: Simplify right side
    1,239.66x = 947,787.01
  5. Step 5: Solve for x
    x = 947,787.01/1,239.66
  6. Step 6: Final answer
    x = 764.55

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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.