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Finding the Fourth Proportional to 19,990.89, 29,980.82 and 7,509.93

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Solution

The fourth proportional to 19,990.89, 29,980.82 and 7,509.93 is: 11,262.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,990.89 : 29,980.82 = 7,509.93 : x
  2. Step 2: Convert to fraction form
    19,990.89/29,980.82 = 7,509.93/x
  3. Step 3: Cross multiply
    19,990.89x = 29,980.82 × 7,509.93
  4. Step 4: Simplify right side
    19,990.89x = 225,153,821.99
  5. Step 5: Solve for x
    x = 225,153,821.99/19,990.89
  6. Step 6: Final answer
    x = 11,262.82

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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.