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Finding the Fourth Proportional to 420,330.57, 630,501.36 and 139,847.82

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Solution

The fourth proportional to 420,330.57, 630,501.36 and 139,847.82 is: 209,773.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,330.57 : 630,501.36 = 139,847.82 : x
  2. Step 2: Convert to fraction form
    420,330.57/630,501.36 = 139,847.82/x
  3. Step 3: Cross multiply
    420,330.57x = 630,501.36 × 139,847.82
  4. Step 4: Simplify right side
    420,330.57x = 88,174,240,703.04
  5. Step 5: Solve for x
    x = 88,174,240,703.04/420,330.57
  6. Step 6: Final answer
    x = 209,773.56

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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.