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Finding the Fourth Proportional to 15,703.57, 21,671.95 and 9,739.21

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Solution

The fourth proportional to 15,703.57, 21,671.95 and 9,739.21 is: 13,440.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,703.57 : 21,671.95 = 9,739.21 : x
  2. Step 2: Convert to fraction form
    15,703.57/21,671.95 = 9,739.21/x
  3. Step 3: Cross multiply
    15,703.57x = 21,671.95 × 9,739.21
  4. Step 4: Simplify right side
    15,703.57x = 211,067,711.42
  5. Step 5: Solve for x
    x = 211,067,711.42/15,703.57
  6. Step 6: Final answer
    x = 13,440.75

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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.