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Finding the Fourth Proportional to 1,913.13, 2,870.67 and 817.20

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Solution

The fourth proportional to 1,913.13, 2,870.67 and 817.20 is: 1,226.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.13 : 2,870.67 = 817.20 : x
  2. Step 2: Convert to fraction form
    1,913.13/2,870.67 = 817.20/x
  3. Step 3: Cross multiply
    1,913.13x = 2,870.67 × 817.20
  4. Step 4: Simplify right side
    1,913.13x = 2,345,911.52
  5. Step 5: Solve for x
    x = 2,345,911.52/1,913.13
  6. Step 6: Final answer
    x = 1,226.22

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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.