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Finding the Fourth Proportional to 2,139.36, 2,952.36 and 1,207.68

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Solution

The fourth proportional to 2,139.36, 2,952.36 and 1,207.68 is: 1,666.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.36 : 2,952.36 = 1,207.68 : x
  2. Step 2: Convert to fraction form
    2,139.36/2,952.36 = 1,207.68/x
  3. Step 3: Cross multiply
    2,139.36x = 2,952.36 × 1,207.68
  4. Step 4: Simplify right side
    2,139.36x = 3,565,506.12
  5. Step 5: Solve for x
    x = 3,565,506.12/2,139.36
  6. Step 6: Final answer
    x = 1,666.62

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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.