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Finding the Fourth Proportional to 1,718.61, 2,578.05 and 678.66

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Solution

The fourth proportional to 1,718.61, 2,578.05 and 678.66 is: 1,018.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,718.61 : 2,578.05 = 678.66 : x
  2. Step 2: Convert to fraction form
    1,718.61/2,578.05 = 678.66/x
  3. Step 3: Cross multiply
    1,718.61x = 2,578.05 × 678.66
  4. Step 4: Simplify right side
    1,718.61x = 1,749,619.41
  5. Step 5: Solve for x
    x = 1,749,619.41/1,718.61
  6. Step 6: Final answer
    x = 1,018.04

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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.