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Finding the Fourth Proportional to 18,996.99, 28,495.17 and 7,312.74

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Solution

The fourth proportional to 18,996.99, 28,495.17 and 7,312.74 is: 10,968.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,996.99 : 28,495.17 = 7,312.74 : x
  2. Step 2: Convert to fraction form
    18,996.99/28,495.17 = 7,312.74/x
  3. Step 3: Cross multiply
    18,996.99x = 28,495.17 × 7,312.74
  4. Step 4: Simplify right side
    18,996.99x = 208,377,769.47
  5. Step 5: Solve for x
    x = 208,377,769.47/18,996.99
  6. Step 6: Final answer
    x = 10,968.99

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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.