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Finding the Fourth Proportional to 1,386.09, 2,080.10 and 1,253.74

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Solution

The fourth proportional to 1,386.09, 2,080.10 and 1,253.74 is: 1,881.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.09 : 2,080.10 = 1,253.74 : x
  2. Step 2: Convert to fraction form
    1,386.09/2,080.10 = 1,253.74/x
  3. Step 3: Cross multiply
    1,386.09x = 2,080.10 × 1,253.74
  4. Step 4: Simplify right side
    1,386.09x = 2,607,899.36
  5. Step 5: Solve for x
    x = 2,607,899.36/1,386.09
  6. Step 6: Final answer
    x = 1,881.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.