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Finding the Fourth Proportional to 19,739.60, 29,560.80 and 9,339.20

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Solution

The fourth proportional to 19,739.60, 29,560.80 and 9,339.20 is: 13,985.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,739.60 : 29,560.80 = 9,339.20 : x
  2. Step 2: Convert to fraction form
    19,739.60/29,560.80 = 9,339.20/x
  3. Step 3: Cross multiply
    19,739.60x = 29,560.80 × 9,339.20
  4. Step 4: Simplify right side
    19,739.60x = 276,074,223.36
  5. Step 5: Solve for x
    x = 276,074,223.36/19,739.60
  6. Step 6: Final answer
    x = 13,985.81

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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.