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Finding the Fourth Proportional to 717,681.45, 990,400.73 and 395,388.73

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Solution

The fourth proportional to 717,681.45, 990,400.73 and 395,388.73 is: 545,636.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,681.45 : 990,400.73 = 395,388.73 : x
  2. Step 2: Convert to fraction form
    717,681.45/990,400.73 = 395,388.73/x
  3. Step 3: Cross multiply
    717,681.45x = 990,400.73 × 395,388.73
  4. Step 4: Simplify right side
    717,681.45x = 391,593,286,825.77
  5. Step 5: Solve for x
    x = 391,593,286,825.77/717,681.45
  6. Step 6: Final answer
    x = 545,636.63

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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.