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Finding the Fourth Proportional to 18,728.10, 28,055.70 and 10,393.20

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Solution

The fourth proportional to 18,728.10, 28,055.70 and 10,393.20 is: 15,569.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,728.10 : 28,055.70 = 10,393.20 : x
  2. Step 2: Convert to fraction form
    18,728.10/28,055.70 = 10,393.20/x
  3. Step 3: Cross multiply
    18,728.10x = 28,055.70 × 10,393.20
  4. Step 4: Simplify right side
    18,728.10x = 291,588,501.24
  5. Step 5: Solve for x
    x = 291,588,501.24/18,728.10
  6. Step 6: Final answer
    x = 15,569.57

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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.