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Finding the Fourth Proportional to 628,653.10, 866,938.26 and 422,387.95

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Solution

The fourth proportional to 628,653.10, 866,938.26 and 422,387.95 is: 582,490.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,653.10 : 866,938.26 = 422,387.95 : x
  2. Step 2: Convert to fraction form
    628,653.10/866,938.26 = 422,387.95/x
  3. Step 3: Cross multiply
    628,653.10x = 866,938.26 × 422,387.95
  4. Step 4: Simplify right side
    628,653.10x = 366,184,274,417.97
  5. Step 5: Solve for x
    x = 366,184,274,417.97/628,653.10
  6. Step 6: Final answer
    x = 582,490.21

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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.