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Finding the Fourth Proportional to 13,579.32, 18,738.70 and 7,915

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Solution

The fourth proportional to 13,579.32, 18,738.70 and 7,915 is: 10,922.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,579.32 : 18,738.70 = 7,915 : x
  2. Step 2: Convert to fraction form
    13,579.32/18,738.70 = 7,915/x
  3. Step 3: Cross multiply
    13,579.32x = 18,738.70 × 7,915
  4. Step 4: Simplify right side
    13,579.32x = 148,316,810.50
  5. Step 5: Solve for x
    x = 148,316,810.50/13,579.32
  6. Step 6: Final answer
    x = 10,922.26

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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.