Home / 2,101.86-2,901.20-1,218.06

Finding the Fourth Proportional to 2,101.86, 2,901.20 and 1,218.06

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Solution

The fourth proportional to 2,101.86, 2,901.20 and 1,218.06 is: 1,681.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,101.86 : 2,901.20 = 1,218.06 : x
  2. Step 2: Convert to fraction form
    2,101.86/2,901.20 = 1,218.06/x
  3. Step 3: Cross multiply
    2,101.86x = 2,901.20 × 1,218.06
  4. Step 4: Simplify right side
    2,101.86x = 3,533,829.58
  5. Step 5: Solve for x
    x = 3,533,829.58/2,101.86
  6. Step 6: Final answer
    x = 1,681.29

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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.