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Finding the Fourth Proportional to 1,939.18, 2,910.03 and 784.66

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Solution

The fourth proportional to 1,939.18, 2,910.03 and 784.66 is: 1,177.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.18 : 2,910.03 = 784.66 : x
  2. Step 2: Convert to fraction form
    1,939.18/2,910.03 = 784.66/x
  3. Step 3: Cross multiply
    1,939.18x = 2,910.03 × 784.66
  4. Step 4: Simplify right side
    1,939.18x = 2,283,384.14
  5. Step 5: Solve for x
    x = 2,283,384.14/1,939.18
  6. Step 6: Final answer
    x = 1,177.50

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1.5x scale

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.