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Finding the Fourth Proportional to 1,865.41, 2,798.20 and 478.75

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Solution

The fourth proportional to 1,865.41, 2,798.20 and 478.75 is: 718.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.41 : 2,798.20 = 478.75 : x
  2. Step 2: Convert to fraction form
    1,865.41/2,798.20 = 478.75/x
  3. Step 3: Cross multiply
    1,865.41x = 2,798.20 × 478.75
  4. Step 4: Simplify right side
    1,865.41x = 1,339,638.25
  5. Step 5: Solve for x
    x = 1,339,638.25/1,865.41
  6. Step 6: Final answer
    x = 718.15

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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.