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Finding the Fourth Proportional to 136,989.60, 189,165.90 and 86,090.50

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Solution

The fourth proportional to 136,989.60, 189,165.90 and 86,090.50 is: 118,880.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,989.60 : 189,165.90 = 86,090.50 : x
  2. Step 2: Convert to fraction form
    136,989.60/189,165.90 = 86,090.50/x
  3. Step 3: Cross multiply
    136,989.60x = 189,165.90 × 86,090.50
  4. Step 4: Simplify right side
    136,989.60x = 16,285,386,913.95
  5. Step 5: Solve for x
    x = 16,285,386,913.95/136,989.60
  6. Step 6: Final answer
    x = 118,880.46

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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.