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Finding the Fourth Proportional to 1,387.10, 1,914.28 and 797.70

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Solution

The fourth proportional to 1,387.10, 1,914.28 and 797.70 is: 1,100.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.10 : 1,914.28 = 797.70 : x
  2. Step 2: Convert to fraction form
    1,387.10/1,914.28 = 797.70/x
  3. Step 3: Cross multiply
    1,387.10x = 1,914.28 × 797.70
  4. Step 4: Simplify right side
    1,387.10x = 1,527,021.16
  5. Step 5: Solve for x
    x = 1,527,021.16/1,387.10
  6. Step 6: Final answer
    x = 1,100.87

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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.