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Finding the Fourth Proportional to 1,913.76, 2,870.82 and 681.12

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Solution

The fourth proportional to 1,913.76, 2,870.82 and 681.12 is: 1,021.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.76 : 2,870.82 = 681.12 : x
  2. Step 2: Convert to fraction form
    1,913.76/2,870.82 = 681.12/x
  3. Step 3: Cross multiply
    1,913.76x = 2,870.82 × 681.12
  4. Step 4: Simplify right side
    1,913.76x = 1,955,372.92
  5. Step 5: Solve for x
    x = 1,955,372.92/1,913.76
  6. Step 6: Final answer
    x = 1,021.74

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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.