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Finding the Fourth Proportional to 19,409.60, 29,089.20 and 8,999.20

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Solution

The fourth proportional to 19,409.60, 29,089.20 and 8,999.20 is: 13,487.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,409.60 : 29,089.20 = 8,999.20 : x
  2. Step 2: Convert to fraction form
    19,409.60/29,089.20 = 8,999.20/x
  3. Step 3: Cross multiply
    19,409.60x = 29,089.20 × 8,999.20
  4. Step 4: Simplify right side
    19,409.60x = 261,779,528.64
  5. Step 5: Solve for x
    x = 261,779,528.64/19,409.60
  6. Step 6: Final answer
    x = 13,487.12

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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.