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Finding the Fourth Proportional to 18,860.72, 28,280.24 and 7,775.06

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Solution

The fourth proportional to 18,860.72, 28,280.24 and 7,775.06 is: 11,658.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,860.72 : 28,280.24 = 7,775.06 : x
  2. Step 2: Convert to fraction form
    18,860.72/28,280.24 = 7,775.06/x
  3. Step 3: Cross multiply
    18,860.72x = 28,280.24 × 7,775.06
  4. Step 4: Simplify right side
    18,860.72x = 219,880,562.81
  5. Step 5: Solve for x
    x = 219,880,562.81/18,860.72
  6. Step 6: Final answer
    x = 11,658.12

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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.