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Finding the Fourth Proportional to 19,457.20, 29,212.80 and 12,480.40

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Solution

The fourth proportional to 19,457.20, 29,212.80 and 12,480.40 is: 18,737.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,457.20 : 29,212.80 = 12,480.40 : x
  2. Step 2: Convert to fraction form
    19,457.20/29,212.80 = 12,480.40/x
  3. Step 3: Cross multiply
    19,457.20x = 29,212.80 × 12,480.40
  4. Step 4: Simplify right side
    19,457.20x = 364,587,429.12
  5. Step 5: Solve for x
    x = 364,587,429.12/19,457.20
  6. Step 6: Final answer
    x = 18,737.92

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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.