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Finding the Fourth Proportional to 99,210.86, 136,912.02 and 53,889.72

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Solution

The fourth proportional to 99,210.86, 136,912.02 and 53,889.72 is: 74,368.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,210.86 : 136,912.02 = 53,889.72 : x
  2. Step 2: Convert to fraction form
    99,210.86/136,912.02 = 53,889.72/x
  3. Step 3: Cross multiply
    99,210.86x = 136,912.02 × 53,889.72
  4. Step 4: Simplify right side
    99,210.86x = 7,378,150,422.43
  5. Step 5: Solve for x
    x = 7,378,150,422.43/99,210.86
  6. Step 6: Final answer
    x = 74,368.38

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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.