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Finding the Fourth Proportional to 715,609.76, 987,479.78 and 421,228.22

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Solution

The fourth proportional to 715,609.76, 987,479.78 and 421,228.22 is: 581,258.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,609.76 : 987,479.78 = 421,228.22 : x
  2. Step 2: Convert to fraction form
    715,609.76/987,479.78 = 421,228.22/x
  3. Step 3: Cross multiply
    715,609.76x = 987,479.78 × 421,228.22
  4. Step 4: Simplify right side
    715,609.76x = 415,954,342,971.85
  5. Step 5: Solve for x
    x = 415,954,342,971.85/715,609.76
  6. Step 6: Final answer
    x = 581,258.63

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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.