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Finding the Fourth Proportional to 20,711.66, 30,911.00 and 19,307.12

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Solution

The fourth proportional to 20,711.66, 30,911.00 and 19,307.12 is: 28,814.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.66 : 30,911.00 = 19,307.12 : x
  2. Step 2: Convert to fraction form
    20,711.66/30,911.00 = 19,307.12/x
  3. Step 3: Cross multiply
    20,711.66x = 30,911.00 × 19,307.12
  4. Step 4: Simplify right side
    20,711.66x = 596,802,135.23
  5. Step 5: Solve for x
    x = 596,802,135.23/20,711.66
  6. Step 6: Final answer
    x = 28,814.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.