Home / 1,385.19-1,911.13-787.63

Finding the Fourth Proportional to 1,385.19, 1,911.13 and 787.63

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Solution

The fourth proportional to 1,385.19, 1,911.13 and 787.63 is: 1,086.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,385.19 : 1,911.13 = 787.63 : x
  2. Step 2: Convert to fraction form
    1,385.19/1,911.13 = 787.63/x
  3. Step 3: Cross multiply
    1,385.19x = 1,911.13 × 787.63
  4. Step 4: Simplify right side
    1,385.19x = 1,505,270.07
  5. Step 5: Solve for x
    x = 1,505,270.07/1,385.19
  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.