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Finding the Fourth Proportional to 207,189.81, 285,925.95 and 121,156.47

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Solution

The fourth proportional to 207,189.81, 285,925.95 and 121,156.47 is: 167,198.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,189.81 : 285,925.95 = 121,156.47 : x
  2. Step 2: Convert to fraction form
    207,189.81/285,925.95 = 121,156.47/x
  3. Step 3: Cross multiply
    207,189.81x = 285,925.95 × 121,156.47
  4. Step 4: Simplify right side
    207,189.81x = 34,641,778,783.40
  5. Step 5: Solve for x
    x = 34,641,778,783.40/207,189.81
  6. Step 6: Final answer
    x = 167,198.27

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1.5x scale

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.