Home / 645,651.78-890,380.28-427,514.34

Finding the Fourth Proportional to 645,651.78, 890,380.28 and 427,514.34

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Solution

The fourth proportional to 645,651.78, 890,380.28 and 427,514.34 is: 589,559.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,651.78 : 890,380.28 = 427,514.34 : x
  2. Step 2: Convert to fraction form
    645,651.78/890,380.28 = 427,514.34/x
  3. Step 3: Cross multiply
    645,651.78x = 890,380.28 × 427,514.34
  4. Step 4: Simplify right side
    645,651.78x = 380,650,337,753.22
  5. Step 5: Solve for x
    x = 380,650,337,753.22/645,651.78
  6. Step 6: Final answer
    x = 589,559.81

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Double scale
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1.5x scale

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.