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Finding the Fourth Proportional to 19,187.78, 28,728.53 and 9,807.60

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Solution

The fourth proportional to 19,187.78, 28,728.53 and 9,807.60 is: 14,684.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,187.78 : 28,728.53 = 9,807.60 : x
  2. Step 2: Convert to fraction form
    19,187.78/28,728.53 = 9,807.60/x
  3. Step 3: Cross multiply
    19,187.78x = 28,728.53 × 9,807.60
  4. Step 4: Simplify right side
    19,187.78x = 281,757,881.79
  5. Step 5: Solve for x
    x = 281,757,881.79/19,187.78
  6. Step 6: Final answer
    x = 14,684.24

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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.