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Finding the Fourth Proportional to 657,620.16, 907,418.52 and 399,362.80

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Solution

The fourth proportional to 657,620.16, 907,418.52 and 399,362.80 is: 551,061.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,620.16 : 907,418.52 = 399,362.80 : x
  2. Step 2: Convert to fraction form
    657,620.16/907,418.52 = 399,362.80/x
  3. Step 3: Cross multiply
    657,620.16x = 907,418.52 × 399,362.80
  4. Step 4: Simplify right side
    657,620.16x = 362,389,200,919.06
  5. Step 5: Solve for x
    x = 362,389,200,919.06/657,620.16
  6. Step 6: Final answer
    x = 551,061.57

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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.