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Finding the Fourth Proportional to 13,157.05, 18,156.51 and 7,188.59

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Solution

The fourth proportional to 13,157.05, 18,156.51 and 7,188.59 is: 9,920.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,157.05 : 18,156.51 = 7,188.59 : x
  2. Step 2: Convert to fraction form
    13,157.05/18,156.51 = 7,188.59/x
  3. Step 3: Cross multiply
    13,157.05x = 18,156.51 × 7,188.59
  4. Step 4: Simplify right side
    13,157.05x = 130,519,710.48
  5. Step 5: Solve for x
    x = 130,519,710.48/13,157.05
  6. Step 6: Final answer
    x = 9,920.14

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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.