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Finding the Fourth Proportional to 420,001.95, 630,005.21 and 104,458.86

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Solution

The fourth proportional to 420,001.95, 630,005.21 and 104,458.86 is: 156,688.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,001.95 : 630,005.21 = 104,458.86 : x
  2. Step 2: Convert to fraction form
    420,001.95/630,005.21 = 104,458.86/x
  3. Step 3: Cross multiply
    420,001.95x = 630,005.21 × 104,458.86
  4. Step 4: Simplify right side
    420,001.95x = 65,809,625,900.09
  5. Step 5: Solve for x
    x = 65,809,625,900.09/420,001.95
  6. Step 6: Final answer
    x = 156,688.86

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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.