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Finding the Fourth Proportional to 210,005.80, 315,008.70 and 69,764.43

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Solution

The fourth proportional to 210,005.80, 315,008.70 and 69,764.43 is: 104,646.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,005.80 : 315,008.70 = 69,764.43 : x
  2. Step 2: Convert to fraction form
    210,005.80/315,008.70 = 69,764.43/x
  3. Step 3: Cross multiply
    210,005.80x = 315,008.70 × 69,764.43
  4. Step 4: Simplify right side
    210,005.80x = 21,976,402,400.54
  5. Step 5: Solve for x
    x = 21,976,402,400.54/210,005.80
  6. Step 6: Final answer
    x = 104,646.65

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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.