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Finding the Fourth Proportional to 154,749, 213,556.86 and 87,681

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Solution

The fourth proportional to 154,749, 213,556.86 and 87,681 is: 121,001.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,749 : 213,556.86 = 87,681 : x
  2. Step 2: Convert to fraction form
    154,749/213,556.86 = 87,681/x
  3. Step 3: Cross multiply
    154,749x = 213,556.86 × 87,681
  4. Step 4: Simplify right side
    154,749x = 18,724,879,041.66
  5. Step 5: Solve for x
    x = 18,724,879,041.66/154,749
  6. Step 6: Final answer
    x = 121,001.62

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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.