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Finding the Fourth Proportional to 100,015.40, 138,039.72 and 64,250.12

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Solution

The fourth proportional to 100,015.40, 138,039.72 and 64,250.12 is: 88,677.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,015.40 : 138,039.72 = 64,250.12 : x
  2. Step 2: Convert to fraction form
    100,015.40/138,039.72 = 64,250.12/x
  3. Step 3: Cross multiply
    100,015.40x = 138,039.72 × 64,250.12
  4. Step 4: Simplify right side
    100,015.40x = 8,869,068,574.77
  5. Step 5: Solve for x
    x = 8,869,068,574.77/100,015.40
  6. Step 6: Final answer
    x = 88,677.03

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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.