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Finding the Fourth Proportional to 660,070.10, 990,105.15 and 423,874.10

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Solution

The fourth proportional to 660,070.10, 990,105.15 and 423,874.10 is: 635,811.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,070.10 : 990,105.15 = 423,874.10 : x
  2. Step 2: Convert to fraction form
    660,070.10/990,105.15 = 423,874.10/x
  3. Step 3: Cross multiply
    660,070.10x = 990,105.15 × 423,874.10
  4. Step 4: Simplify right side
    660,070.10x = 419,679,929,361.62
  5. Step 5: Solve for x
    x = 419,679,929,361.62/660,070.10
  6. Step 6: Final answer
    x = 635,811.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.