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Finding the Fourth Proportional to 1,939.83, 2,909.72 and 478.98

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Solution

The fourth proportional to 1,939.83, 2,909.72 and 478.98 is: 718.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.83 : 2,909.72 = 478.98 : x
  2. Step 2: Convert to fraction form
    1,939.83/2,909.72 = 478.98/x
  3. Step 3: Cross multiply
    1,939.83x = 2,909.72 × 478.98
  4. Step 4: Simplify right side
    1,939.83x = 1,393,695.29
  5. Step 5: Solve for x
    x = 1,393,695.29/1,939.83
  6. Step 6: Final answer
    x = 718.46

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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.