Home / 2,275.12-3,139.74-1,280.50

Finding the Fourth Proportional to 2,275.12, 3,139.74 and 1,280.50

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Solution

The fourth proportional to 2,275.12, 3,139.74 and 1,280.50 is: 1,767.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,275.12 : 3,139.74 = 1,280.50 : x
  2. Step 2: Convert to fraction form
    2,275.12/3,139.74 = 1,280.50/x
  3. Step 3: Cross multiply
    2,275.12x = 3,139.74 × 1,280.50
  4. Step 4: Simplify right side
    2,275.12x = 4,020,437.07
  5. Step 5: Solve for x
    x = 4,020,437.07/2,275.12
  6. Step 6: Final answer
    x = 1,767.13

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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.