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Finding the Fourth Proportional to 2,686.64, 3,707.40 and 1,507.79

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Solution

The fourth proportional to 2,686.64, 3,707.40 and 1,507.79 is: 2,080.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686.64 : 3,707.40 = 1,507.79 : x
  2. Step 2: Convert to fraction form
    2,686.64/3,707.40 = 1,507.79/x
  3. Step 3: Cross multiply
    2,686.64x = 3,707.40 × 1,507.79
  4. Step 4: Simplify right side
    2,686.64x = 5,589,962.11
  5. Step 5: Solve for x
    x = 5,589,962.11/2,686.64
  6. Step 6: Final answer
    x = 2,080.66

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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.