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Finding the Fourth Proportional to 21,909.90, 32,904.45 and 19,188.30

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Solution

The fourth proportional to 21,909.90, 32,904.45 and 19,188.30 is: 28,817.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,909.90 : 32,904.45 = 19,188.30 : x
  2. Step 2: Convert to fraction form
    21,909.90/32,904.45 = 19,188.30/x
  3. Step 3: Cross multiply
    21,909.90x = 32,904.45 × 19,188.30
  4. Step 4: Simplify right side
    21,909.90x = 631,380,457.94
  5. Step 5: Solve for x
    x = 631,380,457.94/21,909.90
  6. Step 6: Final answer
    x = 28,817.13

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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.