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Finding the Fourth Proportional to 100,623.50, 138,863.76 and 55,303.09

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Solution

The fourth proportional to 100,623.50, 138,863.76 and 55,303.09 is: 76,320.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,623.50 : 138,863.76 = 55,303.09 : x
  2. Step 2: Convert to fraction form
    100,623.50/138,863.76 = 55,303.09/x
  3. Step 3: Cross multiply
    100,623.50x = 138,863.76 × 55,303.09
  4. Step 4: Simplify right side
    100,623.50x = 7,679,595,319.65
  5. Step 5: Solve for x
    x = 7,679,595,319.65/100,623.50
  6. Step 6: Final answer
    x = 76,320.10

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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.