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Finding the Fourth Proportional to 100,340.79, 138,468.71 and 55,019.16

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Solution

The fourth proportional to 100,340.79, 138,468.71 and 55,019.16 is: 75,925.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,340.79 : 138,468.71 = 55,019.16 : x
  2. Step 2: Convert to fraction form
    100,340.79/138,468.71 = 55,019.16/x
  3. Step 3: Cross multiply
    100,340.79x = 138,468.71 × 55,019.16
  4. Step 4: Simplify right side
    100,340.79x = 7,618,431,835.39
  5. Step 5: Solve for x
    x = 7,618,431,835.39/100,340.79
  6. Step 6: Final answer
    x = 75,925.57

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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.