Home / 821,106.30-1,231,650.90-260,140.80

Finding the Fourth Proportional to 821,106.30, 1,231,650.90 and 260,140.80

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Solution

The fourth proportional to 821,106.30, 1,231,650.90 and 260,140.80 is: 390,208.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    821,106.30 : 1,231,650.90 = 260,140.80 : x
  2. Step 2: Convert to fraction form
    821,106.30/1,231,650.90 = 260,140.80/x
  3. Step 3: Cross multiply
    821,106.30x = 1,231,650.90 × 260,140.80
  4. Step 4: Simplify right side
    821,106.30x = 320,402,650,446.72
  5. Step 5: Solve for x
    x = 320,402,650,446.72/821,106.30
  6. Step 6: Final answer
    x = 390,208.49

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Double scale
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Similar ratio
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1.5x scale

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.