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Finding the Fourth Proportional to 15,739.74, 21,674.04 and 15,390.54

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Solution

The fourth proportional to 15,739.74, 21,674.04 and 15,390.54 is: 21,193.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,739.74 : 21,674.04 = 15,390.54 : x
  2. Step 2: Convert to fraction form
    15,739.74/21,674.04 = 15,390.54/x
  3. Step 3: Cross multiply
    15,739.74x = 21,674.04 × 15,390.54
  4. Step 4: Simplify right side
    15,739.74x = 333,575,179.58
  5. Step 5: Solve for x
    x = 333,575,179.58/15,739.74
  6. Step 6: Final answer
    x = 21,193.18

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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.