Home / 1,116.38-1,539.36-919.55

Finding the Fourth Proportional to 1,116.38, 1,539.36 and 919.55

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Solution

The fourth proportional to 1,116.38, 1,539.36 and 919.55 is: 1,267.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,116.38 : 1,539.36 = 919.55 : x
  2. Step 2: Convert to fraction form
    1,116.38/1,539.36 = 919.55/x
  3. Step 3: Cross multiply
    1,116.38x = 1,539.36 × 919.55
  4. Step 4: Simplify right side
    1,116.38x = 1,415,510.79
  5. Step 5: Solve for x
    x = 1,415,510.79/1,116.38
  6. Step 6: Final answer
    x = 1,267.95

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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.