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Finding the Fourth Proportional to 136,784.60, 205,061.70 and 71,120.60

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Solution

The fourth proportional to 136,784.60, 205,061.70 and 71,120.60 is: 106,621.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,784.60 : 205,061.70 = 71,120.60 : x
  2. Step 2: Convert to fraction form
    136,784.60/205,061.70 = 71,120.60/x
  3. Step 3: Cross multiply
    136,784.60x = 205,061.70 × 71,120.60
  4. Step 4: Simplify right side
    136,784.60x = 14,584,111,141.02
  5. Step 5: Solve for x
    x = 14,584,111,141.02/136,784.60
  6. Step 6: Final answer
    x = 106,621.00

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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.