Home / 2,275.18-3,138.73-1,390.45

Finding the Fourth Proportional to 2,275.18, 3,138.73 and 1,390.45

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Solution

The fourth proportional to 2,275.18, 3,138.73 and 1,390.45 is: 1,918.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.18 : 3,138.73 = 1,390.45 : x
  2. Step 2: Convert to fraction form
    2,275.18/3,138.73 = 1,390.45/x
  3. Step 3: Cross multiply
    2,275.18x = 3,138.73 × 1,390.45
  4. Step 4: Simplify right side
    2,275.18x = 4,364,247.13
  5. Step 5: Solve for x
    x = 4,364,247.13/2,275.18
  6. Step 6: Final answer
    x = 1,918.20

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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.