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Finding the Fourth Proportional to 13,509.20, 18,644.84 and 7,920.20

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Solution

The fourth proportional to 13,509.20, 18,644.84 and 7,920.20 is: 10,931.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,509.20 : 18,644.84 = 7,920.20 : x
  2. Step 2: Convert to fraction form
    13,509.20/18,644.84 = 7,920.20/x
  3. Step 3: Cross multiply
    13,509.20x = 18,644.84 × 7,920.20
  4. Step 4: Simplify right side
    13,509.20x = 147,670,728.94
  5. Step 5: Solve for x
    x = 147,670,728.94/13,509.20
  6. Step 6: Final answer
    x = 10,931.13

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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.