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Finding the Fourth Proportional to 2,270.80, 3,133.80 and 1,386.40

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Solution

The fourth proportional to 2,270.80, 3,133.80 and 1,386.40 is: 1,913.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,270.80 : 3,133.80 = 1,386.40 : x
  2. Step 2: Convert to fraction form
    2,270.80/3,133.80 = 1,386.40/x
  3. Step 3: Cross multiply
    2,270.80x = 3,133.80 × 1,386.40
  4. Step 4: Simplify right side
    2,270.80x = 4,344,700.32
  5. Step 5: Solve for x
    x = 4,344,700.32/2,270.80
  6. Step 6: Final answer
    x = 1,913.29

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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.