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Finding the Fourth Proportional to 100,484.96, 138,640.83 and 64,695.69

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Solution

The fourth proportional to 100,484.96, 138,640.83 and 64,695.69 is: 89,261.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,484.96 : 138,640.83 = 64,695.69 : x
  2. Step 2: Convert to fraction form
    100,484.96/138,640.83 = 64,695.69/x
  3. Step 3: Cross multiply
    100,484.96x = 138,640.83 × 64,695.69
  4. Step 4: Simplify right side
    100,484.96x = 8,969,464,159.02
  5. Step 5: Solve for x
    x = 8,969,464,159.02/100,484.96
  6. Step 6: Final answer
    x = 89,261.76

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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.