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Finding the Fourth Proportional to 718,002.21, 990,825.98 and 391,325.54

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Solution

The fourth proportional to 718,002.21, 990,825.98 and 391,325.54 is: 540,019.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,002.21 : 990,825.98 = 391,325.54 : x
  2. Step 2: Convert to fraction form
    718,002.21/990,825.98 = 391,325.54/x
  3. Step 3: Cross multiply
    718,002.21x = 990,825.98 × 391,325.54
  4. Step 4: Simplify right side
    718,002.21x = 387,735,504,758.77
  5. Step 5: Solve for x
    x = 387,735,504,758.77/718,002.21
  6. Step 6: Final answer
    x = 540,019.93

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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.