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Finding the Fourth Proportional to 613,009.18, 918,318.21 and 345,961.90

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Solution

The fourth proportional to 613,009.18, 918,318.21 and 345,961.90 is: 518,268.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,009.18 : 918,318.21 = 345,961.90 : x
  2. Step 2: Convert to fraction form
    613,009.18/918,318.21 = 345,961.90/x
  3. Step 3: Cross multiply
    613,009.18x = 918,318.21 × 345,961.90
  4. Step 4: Simplify right side
    613,009.18x = 317,703,112,736.20
  5. Step 5: Solve for x
    x = 317,703,112,736.20/613,009.18
  6. Step 6: Final answer
    x = 518,268.12

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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.