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Finding the Fourth Proportional to 7,043.51, 9,720.05 and 3,899.63

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Solution

The fourth proportional to 7,043.51, 9,720.05 and 3,899.63 is: 5,381.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,043.51 : 9,720.05 = 3,899.63 : x
  2. Step 2: Convert to fraction form
    7,043.51/9,720.05 = 3,899.63/x
  3. Step 3: Cross multiply
    7,043.51x = 9,720.05 × 3,899.63
  4. Step 4: Simplify right side
    7,043.51x = 37,904,530.48
  5. Step 5: Solve for x
    x = 37,904,530.48/7,043.51
  6. Step 6: Final answer
    x = 5,381.49

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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.