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Finding the Fourth Proportional to 100,392.50, 138,545.51 and 55,072.40

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Solution

The fourth proportional to 100,392.50, 138,545.51 and 55,072.40 is: 76,002.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,392.50 : 138,545.51 = 55,072.40 : x
  2. Step 2: Convert to fraction form
    100,392.50/138,545.51 = 55,072.40/x
  3. Step 3: Cross multiply
    100,392.50x = 138,545.51 × 55,072.40
  4. Step 4: Simplify right side
    100,392.50x = 7,630,032,776.83
  5. Step 5: Solve for x
    x = 7,630,032,776.83/100,392.50
  6. Step 6: Final answer
    x = 76,002.02

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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.