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Finding the Fourth Proportional to 20,357.58, 30,491.26 and 15,642.89

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Solution

The fourth proportional to 20,357.58, 30,491.26 and 15,642.89 is: 23,429.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,357.58 : 30,491.26 = 15,642.89 : x
  2. Step 2: Convert to fraction form
    20,357.58/30,491.26 = 15,642.89/x
  3. Step 3: Cross multiply
    20,357.58x = 30,491.26 × 15,642.89
  4. Step 4: Simplify right side
    20,357.58x = 476,971,195.47
  5. Step 5: Solve for x
    x = 476,971,195.47/20,357.58
  6. Step 6: Final answer
    x = 23,429.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.