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Finding the Fourth Proportional to 1,417.15, 1,955.79 and 787.90

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Solution

The fourth proportional to 1,417.15, 1,955.79 and 787.90 is: 1,087.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.15 : 1,955.79 = 787.90 : x
  2. Step 2: Convert to fraction form
    1,417.15/1,955.79 = 787.90/x
  3. Step 3: Cross multiply
    1,417.15x = 1,955.79 × 787.90
  4. Step 4: Simplify right side
    1,417.15x = 1,540,966.94
  5. Step 5: Solve for x
    x = 1,540,966.94/1,417.15
  6. Step 6: Final answer
    x = 1,087.37

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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.