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Finding the Fourth Proportional to 28,612.72, 42,905.04 and 11,967.76

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Solution

The fourth proportional to 28,612.72, 42,905.04 and 11,967.76 is: 17,945.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,612.72 : 42,905.04 = 11,967.76 : x
  2. Step 2: Convert to fraction form
    28,612.72/42,905.04 = 11,967.76/x
  3. Step 3: Cross multiply
    28,612.72x = 42,905.04 × 11,967.76
  4. Step 4: Simplify right side
    28,612.72x = 513,477,221.51
  5. Step 5: Solve for x
    x = 513,477,221.51/28,612.72
  6. Step 6: Final answer
    x = 17,945.77

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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.