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Finding the Fourth Proportional to 1,259.58, 1,737.81 and 787.89

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Solution

The fourth proportional to 1,259.58, 1,737.81 and 787.89 is: 1,087.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.58 : 1,737.81 = 787.89 : x
  2. Step 2: Convert to fraction form
    1,259.58/1,737.81 = 787.89/x
  3. Step 3: Cross multiply
    1,259.58x = 1,737.81 × 787.89
  4. Step 4: Simplify right side
    1,259.58x = 1,369,203.12
  5. Step 5: Solve for x
    x = 1,369,203.12/1,259.58
  6. Step 6: Final answer
    x = 1,087.03

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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.