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Finding the Fourth Proportional to 420,171.78, 630,257.35 and 124,683.78

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Solution

The fourth proportional to 420,171.78, 630,257.35 and 124,683.78 is: 187,025.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,171.78 : 630,257.35 = 124,683.78 : x
  2. Step 2: Convert to fraction form
    420,171.78/630,257.35 = 124,683.78/x
  3. Step 3: Cross multiply
    420,171.78x = 630,257.35 × 124,683.78
  4. Step 4: Simplify right side
    420,171.78x = 78,582,868,770.78
  5. Step 5: Solve for x
    x = 78,582,868,770.78/420,171.78
  6. Step 6: Final answer
    x = 187,025.58

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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.