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Finding the Fourth Proportional to 207,930.65, 287,005.64 and 121,908.30

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Solution

The fourth proportional to 207,930.65, 287,005.64 and 121,908.30 is: 168,269.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,930.65 : 287,005.64 = 121,908.30 : x
  2. Step 2: Convert to fraction form
    207,930.65/287,005.64 = 121,908.30/x
  3. Step 3: Cross multiply
    207,930.65x = 287,005.64 × 121,908.30
  4. Step 4: Simplify right side
    207,930.65x = 34,988,369,662.81
  5. Step 5: Solve for x
    x = 34,988,369,662.81/207,930.65
  6. Step 6: Final answer
    x = 168,269.42

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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.