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Finding the Fourth Proportional to 890,170, 1,335,465 and 291,128.80

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Solution

The fourth proportional to 890,170, 1,335,465 and 291,128.80 is: 436,761.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    890,170 : 1,335,465 = 291,128.80 : x
  2. Step 2: Convert to fraction form
    890,170/1,335,465 = 291,128.80/x
  3. Step 3: Cross multiply
    890,170x = 1,335,465 × 291,128.80
  4. Step 4: Simplify right side
    890,170x = 388,792,322,892
  5. Step 5: Solve for x
    x = 388,792,322,892/890,170
  6. Step 6: Final answer
    x = 436,761.88

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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.