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Finding the Fourth Proportional to 1,376.64, 1,900 and 787.36

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Solution

The fourth proportional to 1,376.64, 1,900 and 787.36 is: 1,086.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.64 : 1,900 = 787.36 : x
  2. Step 2: Convert to fraction form
    1,376.64/1,900 = 787.36/x
  3. Step 3: Cross multiply
    1,376.64x = 1,900 × 787.36
  4. Step 4: Simplify right side
    1,376.64x = 1,495,984
  5. Step 5: Solve for x
    x = 1,495,984/1,376.64
  6. Step 6: Final answer
    x = 1,086.69

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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.