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Finding the Fourth Proportional to 100,404.19, 138,651.54 and 64,657.07

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Solution

The fourth proportional to 100,404.19, 138,651.54 and 64,657.07 is: 89,287.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,404.19 : 138,651.54 = 64,657.07 : x
  2. Step 2: Convert to fraction form
    100,404.19/138,651.54 = 64,657.07/x
  3. Step 3: Cross multiply
    100,404.19x = 138,651.54 × 64,657.07
  4. Step 4: Simplify right side
    100,404.19x = 8,964,802,327.39
  5. Step 5: Solve for x
    x = 8,964,802,327.39/100,404.19
  6. Step 6: Final answer
    x = 89,287.13

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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.