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Finding the Fourth Proportional to 628,699.20, 943,276.16 and 388,532

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Solution

The fourth proportional to 628,699.20, 943,276.16 and 388,532 is: 582,938.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,699.20 : 943,276.16 = 388,532 : x
  2. Step 2: Convert to fraction form
    628,699.20/943,276.16 = 388,532/x
  3. Step 3: Cross multiply
    628,699.20x = 943,276.16 × 388,532
  4. Step 4: Simplify right side
    628,699.20x = 366,492,972,997.12
  5. Step 5: Solve for x
    x = 366,492,972,997.12/628,699.20
  6. Step 6: Final answer
    x = 582,938.51

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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.