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Finding the Fourth Proportional to 1,856.40, 2,785 and 557.84

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Solution

The fourth proportional to 1,856.40, 2,785 and 557.84 is: 836.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,856.40 : 2,785 = 557.84 : x
  2. Step 2: Convert to fraction form
    1,856.40/2,785 = 557.84/x
  3. Step 3: Cross multiply
    1,856.40x = 2,785 × 557.84
  4. Step 4: Simplify right side
    1,856.40x = 1,553,584.40
  5. Step 5: Solve for x
    x = 1,553,584.40/1,856.40
  6. Step 6: Final answer
    x = 836.88

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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.