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Finding the Fourth Proportional to 638,391.87, 880,986.76 and 351,922.20

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Solution

The fourth proportional to 638,391.87, 880,986.76 and 351,922.20 is: 485,655.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,391.87 : 880,986.76 = 351,922.20 : x
  2. Step 2: Convert to fraction form
    638,391.87/880,986.76 = 351,922.20/x
  3. Step 3: Cross multiply
    638,391.87x = 880,986.76 × 351,922.20
  4. Step 4: Simplify right side
    638,391.87x = 310,038,798,750.07
  5. Step 5: Solve for x
    x = 310,038,798,750.07/638,391.87
  6. Step 6: Final answer
    x = 485,655.93

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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.