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Finding the Fourth Proportional to 717,645, 990,395.46 and 395,355.72

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Solution

The fourth proportional to 717,645, 990,395.46 and 395,355.72 is: 545,615.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,645 : 990,395.46 = 395,355.72 : x
  2. Step 2: Convert to fraction form
    717,645/990,395.46 = 395,355.72/x
  3. Step 3: Cross multiply
    717,645x = 990,395.46 × 395,355.72
  4. Step 4: Simplify right side
    717,645x = 391,558,510,173.03
  5. Step 5: Solve for x
    x = 391,558,510,173.03/717,645
  6. Step 6: Final answer
    x = 545,615.88

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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.