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Finding the Fourth Proportional to 135,069.93, 186,387.18 and 74,640

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Solution

The fourth proportional to 135,069.93, 186,387.18 and 74,640 is: 102,998.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,069.93 : 186,387.18 = 74,640 : x
  2. Step 2: Convert to fraction form
    135,069.93/186,387.18 = 74,640/x
  3. Step 3: Cross multiply
    135,069.93x = 186,387.18 × 74,640
  4. Step 4: Simplify right side
    135,069.93x = 13,911,939,115.20
  5. Step 5: Solve for x
    x = 13,911,939,115.20/135,069.93
  6. Step 6: Final answer
    x = 102,998.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.