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Finding the Fourth Proportional to 18,838.80, 28,258.20 and 7,152.06

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Solution

The fourth proportional to 18,838.80, 28,258.20 and 7,152.06 is: 10,728.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,838.80 : 28,258.20 = 7,152.06 : x
  2. Step 2: Convert to fraction form
    18,838.80/28,258.20 = 7,152.06/x
  3. Step 3: Cross multiply
    18,838.80x = 28,258.20 × 7,152.06
  4. Step 4: Simplify right side
    18,838.80x = 202,104,341.89
  5. Step 5: Solve for x
    x = 202,104,341.89/18,838.80
  6. Step 6: Final answer
    x = 10,728.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.