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Finding the Fourth Proportional to 210,320.70, 315,809.10 and 121,747.20

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Solution

The fourth proportional to 210,320.70, 315,809.10 and 121,747.20 is: 182,810.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,320.70 : 315,809.10 = 121,747.20 : x
  2. Step 2: Convert to fraction form
    210,320.70/315,809.10 = 121,747.20/x
  3. Step 3: Cross multiply
    210,320.70x = 315,809.10 × 121,747.20
  4. Step 4: Simplify right side
    210,320.70x = 38,448,873,659.52
  5. Step 5: Solve for x
    x = 38,448,873,659.52/210,320.70
  6. Step 6: Final answer
    x = 182,810.70

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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.