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Finding the Fourth Proportional to 420,269.70, 630,409.13 and 120,752.76

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Solution

The fourth proportional to 420,269.70, 630,409.13 and 120,752.76 is: 181,130.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,269.70 : 630,409.13 = 120,752.76 : x
  2. Step 2: Convert to fraction form
    420,269.70/630,409.13 = 120,752.76/x
  3. Step 3: Cross multiply
    420,269.70x = 630,409.13 × 120,752.76
  4. Step 4: Simplify right side
    420,269.70x = 76,123,641,772.94
  5. Step 5: Solve for x
    x = 76,123,641,772.94/420,269.70
  6. Step 6: Final answer
    x = 181,130.45

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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.