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Finding the Fourth Proportional to 420,143.40, 630,215.10 and 367,655.40

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Solution

The fourth proportional to 420,143.40, 630,215.10 and 367,655.40 is: 551,483.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,143.40 : 630,215.10 = 367,655.40 : x
  2. Step 2: Convert to fraction form
    420,143.40/630,215.10 = 367,655.40/x
  3. Step 3: Cross multiply
    420,143.40x = 630,215.10 × 367,655.40
  4. Step 4: Simplify right side
    420,143.40x = 231,701,984,676.54
  5. Step 5: Solve for x
    x = 231,701,984,676.54/420,143.40
  6. Step 6: Final answer
    x = 551,483.10

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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.