Home / 717,143,940-989,632,509.17-399,587,778.36

Finding the Fourth Proportional to 717,143,940, 989,632,509.17 and 399,587,778.36

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Solution

The fourth proportional to 717,143,940, 989,632,509.17 and 399,587,778.36 is: 551,416,575.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,143,940 : 989,632,509.17 = 399,587,778.36 : x
  2. Step 2: Convert to fraction form
    717,143,940/989,632,509.17 = 399,587,778.36/x
  3. Step 3: Cross multiply
    717,143,940x = 989,632,509.17 × 399,587,778.36
  4. Step 4: Simplify right side
    717,143,940x = 395,445,055,730,074,688
  5. Step 5: Solve for x
    x = 395,445,055,730,074,688/717,143,940
  6. Step 6: Final answer
    x = 551,416,575.77

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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.