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Finding the Fourth Proportional to 153,108.66, 211,331.52 and 99,390.54

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Solution

The fourth proportional to 153,108.66, 211,331.52 and 99,390.54 is: 137,185.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,108.66 : 211,331.52 = 99,390.54 : x
  2. Step 2: Convert to fraction form
    153,108.66/211,331.52 = 99,390.54/x
  3. Step 3: Cross multiply
    153,108.66x = 211,331.52 × 99,390.54
  4. Step 4: Simplify right side
    153,108.66x = 21,004,353,891.82
  5. Step 5: Solve for x
    x = 21,004,353,891.82/153,108.66
  6. Step 6: Final answer
    x = 137,185.93

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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.