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Finding the Fourth Proportional to 210,100.66, 315,153.70 and 69,859.28

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Solution

The fourth proportional to 210,100.66, 315,153.70 and 69,859.28 is: 104,789.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,100.66 : 315,153.70 = 69,859.28 : x
  2. Step 2: Convert to fraction form
    210,100.66/315,153.70 = 69,859.28/x
  3. Step 3: Cross multiply
    210,100.66x = 315,153.70 × 69,859.28
  4. Step 4: Simplify right side
    210,100.66x = 22,016,411,184.57
  5. Step 5: Solve for x
    x = 22,016,411,184.57/210,100.66
  6. Step 6: Final answer
    x = 104,789.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.