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Finding the Fourth Proportional to 613,689.16, 920,754.54 and 214,388.68

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Solution

The fourth proportional to 613,689.16, 920,754.54 and 214,388.68 is: 321,660.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,689.16 : 920,754.54 = 214,388.68 : x
  2. Step 2: Convert to fraction form
    613,689.16/920,754.54 = 214,388.68/x
  3. Step 3: Cross multiply
    613,689.16x = 920,754.54 × 214,388.68
  4. Step 4: Simplify right side
    613,689.16x = 197,399,350,434.61
  5. Step 5: Solve for x
    x = 197,399,350,434.61/613,689.16
  6. Step 6: Final answer
    x = 321,660.16

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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.