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Finding the Fourth Proportional to 154,638.65, 213,397.86 and 90,103.86

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Solution

The fourth proportional to 154,638.65, 213,397.86 and 90,103.86 is: 124,341.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,638.65 : 213,397.86 = 90,103.86 : x
  2. Step 2: Convert to fraction form
    154,638.65/213,397.86 = 90,103.86/x
  3. Step 3: Cross multiply
    154,638.65x = 213,397.86 × 90,103.86
  4. Step 4: Simplify right side
    154,638.65x = 19,227,970,901.74
  5. Step 5: Solve for x
    x = 19,227,970,901.74/154,638.65
  6. Step 6: Final answer
    x = 124,341.30

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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.