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Finding the Fourth Proportional to 19,911.20, 29,866.80 and 7,431.20

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Solution

The fourth proportional to 19,911.20, 29,866.80 and 7,431.20 is: 11,146.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,911.20 : 29,866.80 = 7,431.20 : x
  2. Step 2: Convert to fraction form
    19,911.20/29,866.80 = 7,431.20/x
  3. Step 3: Cross multiply
    19,911.20x = 29,866.80 × 7,431.20
  4. Step 4: Simplify right side
    19,911.20x = 221,946,164.16
  5. Step 5: Solve for x
    x = 221,946,164.16/19,911.20
  6. Step 6: Final answer
    x = 11,146.80

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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.