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Finding the Fourth Proportional to 19,840.80, 29,764.80 and 9,955.20

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Solution

The fourth proportional to 19,840.80, 29,764.80 and 9,955.20 is: 14,934.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,840.80 : 29,764.80 = 9,955.20 : x
  2. Step 2: Convert to fraction form
    19,840.80/29,764.80 = 9,955.20/x
  3. Step 3: Cross multiply
    19,840.80x = 29,764.80 × 9,955.20
  4. Step 4: Simplify right side
    19,840.80x = 296,314,536.96
  5. Step 5: Solve for x
    x = 296,314,536.96/19,840.80
  6. Step 6: Final answer
    x = 14,934.61

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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.