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Finding the Fourth Proportional to 1,718.40, 2,578 and 622.77

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Solution

The fourth proportional to 1,718.40, 2,578 and 622.77 is: 934.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.40 : 2,578 = 622.77 : x
  2. Step 2: Convert to fraction form
    1,718.40/2,578 = 622.77/x
  3. Step 3: Cross multiply
    1,718.40x = 2,578 × 622.77
  4. Step 4: Simplify right side
    1,718.40x = 1,605,501.06
  5. Step 5: Solve for x
    x = 1,605,501.06/1,718.40
  6. Step 6: Final answer
    x = 934.30

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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.