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Finding the Fourth Proportional to 1,387,432.55, 1,914,664.60 and 775,611.10

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Solution

The fourth proportional to 1,387,432.55, 1,914,664.60 and 775,611.10 is: 1,070,347.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,432.55 : 1,914,664.60 = 775,611.10 : x
  2. Step 2: Convert to fraction form
    1,387,432.55/1,914,664.60 = 775,611.10/x
  3. Step 3: Cross multiply
    1,387,432.55x = 1,914,664.60 × 775,611.10
  4. Step 4: Simplify right side
    1,387,432.55x = 1,485,035,116,537.06
  5. Step 5: Solve for x
    x = 1,485,035,116,537.06/1,387,432.55
  6. Step 6: Final answer
    x = 1,070,347.61

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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.