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Finding the Fourth Proportional to 18,420.61, 27,612.35 and 10,520.53

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Solution

The fourth proportional to 18,420.61, 27,612.35 and 10,520.53 is: 15,770.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.61 : 27,612.35 = 10,520.53 : x
  2. Step 2: Convert to fraction form
    18,420.61/27,612.35 = 10,520.53/x
  3. Step 3: Cross multiply
    18,420.61x = 27,612.35 × 10,520.53
  4. Step 4: Simplify right side
    18,420.61x = 290,496,474.36
  5. Step 5: Solve for x
    x = 290,496,474.36/18,420.61
  6. Step 6: Final answer
    x = 15,770.19

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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.