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Finding the Fourth Proportional to 287,990.65, 397,423.65 and 158,930.11

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Solution

The fourth proportional to 287,990.65, 397,423.65 and 158,930.11 is: 219,321.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,990.65 : 397,423.65 = 158,930.11 : x
  2. Step 2: Convert to fraction form
    287,990.65/397,423.65 = 158,930.11/x
  3. Step 3: Cross multiply
    287,990.65x = 397,423.65 × 158,930.11
  4. Step 4: Simplify right side
    287,990.65x = 63,162,584,411.10
  5. Step 5: Solve for x
    x = 63,162,584,411.10/287,990.65
  6. Step 6: Final answer
    x = 219,321.65

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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.