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Finding the Fourth Proportional to 210,816.60, 315,568.80 and 121,805.70

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Solution

The fourth proportional to 210,816.60, 315,568.80 and 121,805.70 is: 182,329.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,816.60 : 315,568.80 = 121,805.70 : x
  2. Step 2: Convert to fraction form
    210,816.60/315,568.80 = 121,805.70/x
  3. Step 3: Cross multiply
    210,816.60x = 315,568.80 × 121,805.70
  4. Step 4: Simplify right side
    210,816.60x = 38,438,078,582.16
  5. Step 5: Solve for x
    x = 38,438,078,582.16/210,816.60
  6. Step 6: Final answer
    x = 182,329.47

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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.