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Finding the Fourth Proportional to 135,312.58, 186,731.72 and 74,887.39

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Solution

The fourth proportional to 135,312.58, 186,731.72 and 74,887.39 is: 103,344.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,312.58 : 186,731.72 = 74,887.39 : x
  2. Step 2: Convert to fraction form
    135,312.58/186,731.72 = 74,887.39/x
  3. Step 3: Cross multiply
    135,312.58x = 186,731.72 × 74,887.39
  4. Step 4: Simplify right side
    135,312.58x = 13,983,851,141.01
  5. Step 5: Solve for x
    x = 13,983,851,141.01/135,312.58
  6. Step 6: Final answer
    x = 103,344.80

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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.