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Finding the Fourth Proportional to 100,645.49, 138,862.81 and 66,643.10

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Solution

The fourth proportional to 100,645.49, 138,862.81 and 66,643.10 is: 91,948.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,645.49 : 138,862.81 = 66,643.10 : x
  2. Step 2: Convert to fraction form
    100,645.49/138,862.81 = 66,643.10/x
  3. Step 3: Cross multiply
    100,645.49x = 138,862.81 × 66,643.10
  4. Step 4: Simplify right side
    100,645.49x = 9,254,248,449.07
  5. Step 5: Solve for x
    x = 9,254,248,449.07/100,645.49
  6. Step 6: Final answer
    x = 91,948.97

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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.