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Finding the Fourth Proportional to 100,015.50, 138,015.72 and 54,685.02

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Solution

The fourth proportional to 100,015.50, 138,015.72 and 54,685.02 is: 75,462.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,015.50 : 138,015.72 = 54,685.02 : x
  2. Step 2: Convert to fraction form
    100,015.50/138,015.72 = 54,685.02/x
  3. Step 3: Cross multiply
    100,015.50x = 138,015.72 × 54,685.02
  4. Step 4: Simplify right side
    100,015.50x = 7,547,392,408.51
  5. Step 5: Solve for x
    x = 7,547,392,408.51/100,015.50
  6. Step 6: Final answer
    x = 75,462.23

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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.