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Finding the Fourth Proportional to 420,081.53, 630,122.36 and 104,538.40

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Solution

The fourth proportional to 420,081.53, 630,122.36 and 104,538.40 is: 156,807.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,081.53 : 630,122.36 = 104,538.40 : x
  2. Step 2: Convert to fraction form
    420,081.53/630,122.36 = 104,538.40/x
  3. Step 3: Cross multiply
    420,081.53x = 630,122.36 × 104,538.40
  4. Step 4: Simplify right side
    420,081.53x = 65,871,981,220.63
  5. Step 5: Solve for x
    x = 65,871,981,220.63/420,081.53
  6. Step 6: Final answer
    x = 156,807.61

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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.