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Finding the Fourth Proportional to 19,216.60, 28,824.90 and 11,421.40

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Solution

The fourth proportional to 19,216.60, 28,824.90 and 11,421.40 is: 17,132.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,216.60 : 28,824.90 = 11,421.40 : x
  2. Step 2: Convert to fraction form
    19,216.60/28,824.90 = 11,421.40/x
  3. Step 3: Cross multiply
    19,216.60x = 28,824.90 × 11,421.40
  4. Step 4: Simplify right side
    19,216.60x = 329,220,712.86
  5. Step 5: Solve for x
    x = 329,220,712.86/19,216.60
  6. Step 6: Final answer
    x = 17,132.10

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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.