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Finding the Fourth Proportional to 425,659.86, 638,555.40 and 145,111.50

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Solution

The fourth proportional to 425,659.86, 638,555.40 and 145,111.50 is: 217,689.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    425,659.86 : 638,555.40 = 145,111.50 : x
  2. Step 2: Convert to fraction form
    425,659.86/638,555.40 = 145,111.50/x
  3. Step 3: Cross multiply
    425,659.86x = 638,555.40 × 145,111.50
  4. Step 4: Simplify right side
    425,659.86x = 92,661,731,927.10
  5. Step 5: Solve for x
    x = 92,661,731,927.10/425,659.86
  6. Step 6: Final answer
    x = 217,689.62

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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.