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Finding the Fourth Proportional to 718,033.21, 990,887.22 and 391,349.88

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Solution

The fourth proportional to 718,033.21, 990,887.22 and 391,349.88 is: 540,063.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,033.21 : 990,887.22 = 391,349.88 : x
  2. Step 2: Convert to fraction form
    718,033.21/990,887.22 = 391,349.88/x
  3. Step 3: Cross multiply
    718,033.21x = 990,887.22 × 391,349.88
  4. Step 4: Simplify right side
    718,033.21x = 387,783,594,640.53
  5. Step 5: Solve for x
    x = 387,783,594,640.53/718,033.21
  6. Step 6: Final answer
    x = 540,063.59

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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.