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Finding the Fourth Proportional to 15,478.53, 21,311.80 and 13,659.67

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Solution

The fourth proportional to 15,478.53, 21,311.80 and 13,659.67 is: 18,807.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,478.53 : 21,311.80 = 13,659.67 : x
  2. Step 2: Convert to fraction form
    15,478.53/21,311.80 = 13,659.67/x
  3. Step 3: Cross multiply
    15,478.53x = 21,311.80 × 13,659.67
  4. Step 4: Simplify right side
    15,478.53x = 291,112,155.11
  5. Step 5: Solve for x
    x = 291,112,155.11/15,478.53
  6. Step 6: Final answer
    x = 18,807.48

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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.