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Finding the Fourth Proportional to 136,871.60, 205,288.20 and 43,386.80

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Solution

The fourth proportional to 136,871.60, 205,288.20 and 43,386.80 is: 65,074.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,871.60 : 205,288.20 = 43,386.80 : x
  2. Step 2: Convert to fraction form
    136,871.60/205,288.20 = 43,386.80/x
  3. Step 3: Cross multiply
    136,871.60x = 205,288.20 × 43,386.80
  4. Step 4: Simplify right side
    136,871.60x = 8,906,798,075.76
  5. Step 5: Solve for x
    x = 8,906,798,075.76/136,871.60
  6. Step 6: Final answer
    x = 65,074.11

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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.