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Finding the Fourth Proportional to 1,719.29, 2,578.64 and 678.98

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Solution

The fourth proportional to 1,719.29, 2,578.64 and 678.98 is: 1,018.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,719.29 : 2,578.64 = 678.98 : x
  2. Step 2: Convert to fraction form
    1,719.29/2,578.64 = 678.98/x
  3. Step 3: Cross multiply
    1,719.29x = 2,578.64 × 678.98
  4. Step 4: Simplify right side
    1,719.29x = 1,750,848.04
  5. Step 5: Solve for x
    x = 1,750,848.04/1,719.29
  6. Step 6: Final answer
    x = 1,018.35

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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.