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Finding the Fourth Proportional to 1,915.63, 2,643.57 and 1,087.63

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Solution

The fourth proportional to 1,915.63, 2,643.57 and 1,087.63 is: 1,500.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.63 : 2,643.57 = 1,087.63 : x
  2. Step 2: Convert to fraction form
    1,915.63/2,643.57 = 1,087.63/x
  3. Step 3: Cross multiply
    1,915.63x = 2,643.57 × 1,087.63
  4. Step 4: Simplify right side
    1,915.63x = 2,875,226.04
  5. Step 5: Solve for x
    x = 2,875,226.04/1,915.63
  6. Step 6: Final answer
    x = 1,500.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.