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Finding the Fourth Proportional to 100,315.80, 138,480.37 and 64,064.72

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Solution

The fourth proportional to 100,315.80, 138,480.37 and 64,064.72 is: 88,437.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,315.80 : 138,480.37 = 64,064.72 : x
  2. Step 2: Convert to fraction form
    100,315.80/138,480.37 = 64,064.72/x
  3. Step 3: Cross multiply
    100,315.80x = 138,480.37 × 64,064.72
  4. Step 4: Simplify right side
    100,315.80x = 8,871,706,315.59
  5. Step 5: Solve for x
    x = 8,871,706,315.59/100,315.80
  6. Step 6: Final answer
    x = 88,437.78

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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.