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Finding the Fourth Proportional to 738,720, 1,019,436.03 and 399,190.68

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Solution

The fourth proportional to 738,720, 1,019,436.03 and 399,190.68 is: 550,884.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,720 : 1,019,436.03 = 399,190.68 : x
  2. Step 2: Convert to fraction form
    738,720/1,019,436.03 = 399,190.68/x
  3. Step 3: Cross multiply
    738,720x = 1,019,436.03 × 399,190.68
  4. Step 4: Simplify right side
    738,720x = 406,949,362,032.20
  5. Step 5: Solve for x
    x = 406,949,362,032.20/738,720
  6. Step 6: Final answer
    x = 550,884.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.