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Finding the Fourth Proportional to 15,157.46, 20,913.81 and 9,187.90

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Solution

The fourth proportional to 15,157.46, 20,913.81 and 9,187.90 is: 12,677.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,157.46 : 20,913.81 = 9,187.90 : x
  2. Step 2: Convert to fraction form
    15,157.46/20,913.81 = 9,187.90/x
  3. Step 3: Cross multiply
    15,157.46x = 20,913.81 × 9,187.90
  4. Step 4: Simplify right side
    15,157.46x = 192,153,994.90
  5. Step 5: Solve for x
    x = 192,153,994.90/15,157.46
  6. Step 6: Final answer
    x = 12,677.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.