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Finding the Fourth Proportional to 420,142.40, 630,213.60 and 124,654.40

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Solution

The fourth proportional to 420,142.40, 630,213.60 and 124,654.40 is: 186,981.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,142.40 : 630,213.60 = 124,654.40 : x
  2. Step 2: Convert to fraction form
    420,142.40/630,213.60 = 124,654.40/x
  3. Step 3: Cross multiply
    420,142.40x = 630,213.60 × 124,654.40
  4. Step 4: Simplify right side
    420,142.40x = 78,558,898,179.84
  5. Step 5: Solve for x
    x = 78,558,898,179.84/420,142.40
  6. Step 6: Final answer
    x = 186,981.60

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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.