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Finding the Fourth Proportional to 100,158.40, 138,220.20 and 54,835.60

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Solution

The fourth proportional to 100,158.40, 138,220.20 and 54,835.60 is: 75,674.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,158.40 : 138,220.20 = 54,835.60 : x
  2. Step 2: Convert to fraction form
    100,158.40/138,220.20 = 54,835.60/x
  3. Step 3: Cross multiply
    100,158.40x = 138,220.20 × 54,835.60
  4. Step 4: Simplify right side
    100,158.40x = 7,579,387,599.12
  5. Step 5: Solve for x
    x = 7,579,387,599.12/100,158.40
  6. Step 6: Final answer
    x = 75,674.01

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1.5x scale

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.