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Finding the Fourth Proportional to 420,639, 630,959.85 and 105,095.94

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Solution

The fourth proportional to 420,639, 630,959.85 and 105,095.94 is: 157,644.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,639 : 630,959.85 = 105,095.94 : x
  2. Step 2: Convert to fraction form
    420,639/630,959.85 = 105,095.94/x
  3. Step 3: Cross multiply
    420,639x = 630,959.85 × 105,095.94
  4. Step 4: Simplify right side
    420,639x = 66,311,318,538.01
  5. Step 5: Solve for x
    x = 66,311,318,538.01/420,639
  6. Step 6: Final answer
    x = 157,644.25

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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.