Home / 1,380.62-1,905.39-1,030.70

Finding the Fourth Proportional to 1,380.62, 1,905.39 and 1,030.70

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Solution

The fourth proportional to 1,380.62, 1,905.39 and 1,030.70 is: 1,422.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380.62 : 1,905.39 = 1,030.70 : x
  2. Step 2: Convert to fraction form
    1,380.62/1,905.39 = 1,030.70/x
  3. Step 3: Cross multiply
    1,380.62x = 1,905.39 × 1,030.70
  4. Step 4: Simplify right side
    1,380.62x = 1,963,885.47
  5. Step 5: Solve for x
    x = 1,963,885.47/1,380.62
  6. Step 6: Final answer
    x = 1,422.47

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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.