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Finding the Fourth Proportional to 100,386.61, 138,531.13 and 55,064.21

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Solution

The fourth proportional to 100,386.61, 138,531.13 and 55,064.21 is: 75,987.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,386.61 : 138,531.13 = 55,064.21 : x
  2. Step 2: Convert to fraction form
    100,386.61/138,531.13 = 55,064.21/x
  3. Step 3: Cross multiply
    100,386.61x = 138,531.13 × 55,064.21
  4. Step 4: Simplify right side
    100,386.61x = 7,628,106,403.54
  5. Step 5: Solve for x
    x = 7,628,106,403.54/100,386.61
  6. Step 6: Final answer
    x = 75,987.29

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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.