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Finding the Fourth Proportional to 28,641.30, 42,911.12 and 11,964.63

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Solution

The fourth proportional to 28,641.30, 42,911.12 and 11,964.63 is: 17,925.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,641.30 : 42,911.12 = 11,964.63 : x
  2. Step 2: Convert to fraction form
    28,641.30/42,911.12 = 11,964.63/x
  3. Step 3: Cross multiply
    28,641.30x = 42,911.12 × 11,964.63
  4. Step 4: Simplify right side
    28,641.30x = 513,415,613.86
  5. Step 5: Solve for x
    x = 513,415,613.86/28,641.30
  6. Step 6: Final answer
    x = 17,925.71

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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.