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Finding the Fourth Proportional to 1,865.91, 2,798.95 and 479.25

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Solution

The fourth proportional to 1,865.91, 2,798.95 and 479.25 is: 718.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,865.91 : 2,798.95 = 479.25 : x
  2. Step 2: Convert to fraction form
    1,865.91/2,798.95 = 479.25/x
  3. Step 3: Cross multiply
    1,865.91x = 2,798.95 × 479.25
  4. Step 4: Simplify right side
    1,865.91x = 1,341,396.79
  5. Step 5: Solve for x
    x = 1,341,396.79/1,865.91
  6. Step 6: Final answer
    x = 718.90

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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.