Home / 1,272.78-1,899.40-1,265.48

Finding the Fourth Proportional to 1,272.78, 1,899.40 and 1,265.48

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Solution

The fourth proportional to 1,272.78, 1,899.40 and 1,265.48 is: 1,888.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,272.78 : 1,899.40 = 1,265.48 : x
  2. Step 2: Convert to fraction form
    1,272.78/1,899.40 = 1,265.48/x
  3. Step 3: Cross multiply
    1,272.78x = 1,899.40 × 1,265.48
  4. Step 4: Simplify right side
    1,272.78x = 2,403,652.71
  5. Step 5: Solve for x
    x = 2,403,652.71/1,272.78
  6. Step 6: Final answer
    x = 1,888.51

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.