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Finding the Fourth Proportional to 420,740.64, 631,360.80 and 168,140.52

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Solution

The fourth proportional to 420,740.64, 631,360.80 and 168,140.52 is: 252,310.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,740.64 : 631,360.80 = 168,140.52 : x
  2. Step 2: Convert to fraction form
    420,740.64/631,360.80 = 168,140.52/x
  3. Step 3: Cross multiply
    420,740.64x = 631,360.80 × 168,140.52
  4. Step 4: Simplify right side
    420,740.64x = 106,157,333,219.62
  5. Step 5: Solve for x
    x = 106,157,333,219.62/420,740.64
  6. Step 6: Final answer
    x = 252,310.62

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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.