Home / 1,285.32-1,774.26-787.80

Finding the Fourth Proportional to 1,285.32, 1,774.26 and 787.80

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Solution

The fourth proportional to 1,285.32, 1,774.26 and 787.80 is: 1,087.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.32 : 1,774.26 = 787.80 : x
  2. Step 2: Convert to fraction form
    1,285.32/1,774.26 = 787.80/x
  3. Step 3: Cross multiply
    1,285.32x = 1,774.26 × 787.80
  4. Step 4: Simplify right side
    1,285.32x = 1,397,762.03
  5. Step 5: Solve for x
    x = 1,397,762.03/1,285.32
  6. Step 6: Final answer
    x = 1,087.48

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1.5x scale

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.