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Finding the Fourth Proportional to 1,547.92, 2,319.72 and 1,028.20

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Solution

The fourth proportional to 1,547.92, 2,319.72 and 1,028.20 is: 1,540.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,547.92 : 2,319.72 = 1,028.20 : x
  2. Step 2: Convert to fraction form
    1,547.92/2,319.72 = 1,028.20/x
  3. Step 3: Cross multiply
    1,547.92x = 2,319.72 × 1,028.20
  4. Step 4: Simplify right side
    1,547.92x = 2,385,136.10
  5. Step 5: Solve for x
    x = 2,385,136.10/1,547.92
  6. Step 6: Final answer
    x = 1,540.87

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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.