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Finding the Fourth Proportional to 287,911.65, 431,930.66 and 88,247.06

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Solution

The fourth proportional to 287,911.65, 431,930.66 and 88,247.06 is: 132,389.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,911.65 : 431,930.66 = 88,247.06 : x
  2. Step 2: Convert to fraction form
    287,911.65/431,930.66 = 88,247.06/x
  3. Step 3: Cross multiply
    287,911.65x = 431,930.66 × 88,247.06
  4. Step 4: Simplify right side
    287,911.65x = 38,116,610,868.86
  5. Step 5: Solve for x
    x = 38,116,610,868.86/287,911.65
  6. Step 6: Final answer
    x = 132,389.96

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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.