Home / 861,128.12-1,291,982.74-381,290.42

Finding the Fourth Proportional to 861,128.12, 1,291,982.74 and 381,290.42

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Solution

The fourth proportional to 861,128.12, 1,291,982.74 and 381,290.42 is: 572,064.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    861,128.12 : 1,291,982.74 = 381,290.42 : x
  2. Step 2: Convert to fraction form
    861,128.12/1,291,982.74 = 381,290.42/x
  3. Step 3: Cross multiply
    861,128.12x = 1,291,982.74 × 381,290.42
  4. Step 4: Simplify right side
    861,128.12x = 492,620,634,154.21
  5. Step 5: Solve for x
    x = 492,620,634,154.21/861,128.12
  6. Step 6: Final answer
    x = 572,064.28

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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.