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Finding the Fourth Proportional to 420,116.40, 630,077.40 and 139,558.32

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Solution

The fourth proportional to 420,116.40, 630,077.40 and 139,558.32 is: 209,305.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,116.40 : 630,077.40 = 139,558.32 : x
  2. Step 2: Convert to fraction form
    420,116.40/630,077.40 = 139,558.32/x
  3. Step 3: Cross multiply
    420,116.40x = 630,077.40 × 139,558.32
  4. Step 4: Simplify right side
    420,116.40x = 87,932,543,413.97
  5. Step 5: Solve for x
    x = 87,932,543,413.97/420,116.40
  6. Step 6: Final answer
    x = 209,305.19

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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.