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Finding the Fourth Proportional to 543,421.40, 815,132.10 and 419,005.40

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Solution

The fourth proportional to 543,421.40, 815,132.10 and 419,005.40 is: 628,508.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    543,421.40 : 815,132.10 = 419,005.40 : x
  2. Step 2: Convert to fraction form
    543,421.40/815,132.10 = 419,005.40/x
  3. Step 3: Cross multiply
    543,421.40x = 815,132.10 × 419,005.40
  4. Step 4: Simplify right side
    543,421.40x = 341,544,751,613.34
  5. Step 5: Solve for x
    x = 341,544,751,613.34/543,421.40
  6. Step 6: Final answer
    x = 628,508.10

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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.