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Finding the Fourth Proportional to 687,008.76, 948,072.90 and 400,584.20

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Solution

The fourth proportional to 687,008.76, 948,072.90 and 400,584.20 is: 552,806.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,008.76 : 948,072.90 = 400,584.20 : x
  2. Step 2: Convert to fraction form
    687,008.76/948,072.90 = 400,584.20/x
  3. Step 3: Cross multiply
    687,008.76x = 948,072.90 × 400,584.20
  4. Step 4: Simplify right side
    687,008.76x = 379,783,019,447.82
  5. Step 5: Solve for x
    x = 379,783,019,447.82/687,008.76
  6. Step 6: Final answer
    x = 552,806.66

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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.