Home / 689,419.20-1,034,128.80-512,272.20

Finding the Fourth Proportional to 689,419.20, 1,034,128.80 and 512,272.20

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Solution

The fourth proportional to 689,419.20, 1,034,128.80 and 512,272.20 is: 768,408.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    689,419.20 : 1,034,128.80 = 512,272.20 : x
  2. Step 2: Convert to fraction form
    689,419.20/1,034,128.80 = 512,272.20/x
  3. Step 3: Cross multiply
    689,419.20x = 1,034,128.80 × 512,272.20
  4. Step 4: Simplify right side
    689,419.20x = 529,755,435,459.36
  5. Step 5: Solve for x
    x = 529,755,435,459.36/689,419.20
  6. Step 6: Final answer
    x = 768,408.30

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Double scale
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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.