Home / 717,143,939.25-989,632,508.13-399,587,777.61

Finding the Fourth Proportional to 717,143,939.25, 989,632,508.13 and 399,587,777.61

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Solution

The fourth proportional to 717,143,939.25, 989,632,508.13 and 399,587,777.61 is: 551,416,574.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,143,939.25 : 989,632,508.13 = 399,587,777.61 : x
  2. Step 2: Convert to fraction form
    717,143,939.25/989,632,508.13 = 399,587,777.61/x
  3. Step 3: Cross multiply
    717,143,939.25x = 989,632,508.13 × 399,587,777.61
  4. Step 4: Simplify right side
    717,143,939.25x = 395,445,054,574,276,992
  5. Step 5: Solve for x
    x = 395,445,054,574,276,992/717,143,939.25
  6. Step 6: Final answer
    x = 551,416,574.74

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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.