Home / 1,180.19-1,628.61-787.16

Finding the Fourth Proportional to 1,180.19, 1,628.61 and 787.16

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Solution

The fourth proportional to 1,180.19, 1,628.61 and 787.16 is: 1,086.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.19 : 1,628.61 = 787.16 : x
  2. Step 2: Convert to fraction form
    1,180.19/1,628.61 = 787.16/x
  3. Step 3: Cross multiply
    1,180.19x = 1,628.61 × 787.16
  4. Step 4: Simplify right side
    1,180.19x = 1,281,976.65
  5. Step 5: Solve for x
    x = 1,281,976.65/1,180.19
  6. Step 6: Final answer
    x = 1,086.25

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Half scale
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Double scale
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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.