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Finding the Fourth Proportional to 91,860.68, 137,809.67 and 28,678.25

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Solution

The fourth proportional to 91,860.68, 137,809.67 and 28,678.25 is: 43,023.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,860.68 : 137,809.67 = 28,678.25 : x
  2. Step 2: Convert to fraction form
    91,860.68/137,809.67 = 28,678.25/x
  3. Step 3: Cross multiply
    91,860.68x = 137,809.67 × 28,678.25
  4. Step 4: Simplify right side
    91,860.68x = 3,952,140,369.81
  5. Step 5: Solve for x
    x = 3,952,140,369.81/91,860.68
  6. Step 6: Final answer
    x = 43,023.20

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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.