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Finding the Fourth Proportional to 100,515.75, 138,718.80 and 66,465.06

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Solution

The fourth proportional to 100,515.75, 138,718.80 and 66,465.06 is: 91,726.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,515.75 : 138,718.80 = 66,465.06 : x
  2. Step 2: Convert to fraction form
    100,515.75/138,718.80 = 66,465.06/x
  3. Step 3: Cross multiply
    100,515.75x = 138,718.80 × 66,465.06
  4. Step 4: Simplify right side
    100,515.75x = 9,219,953,365.13
  5. Step 5: Solve for x
    x = 9,219,953,365.13/100,515.75
  6. Step 6: Final answer
    x = 91,726.45

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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.