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Finding the Fourth Proportional to 390,110.57, 585,334.88 and 137,571.50

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Solution

The fourth proportional to 390,110.57, 585,334.88 and 137,571.50 is: 206,416.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,110.57 : 585,334.88 = 137,571.50 : x
  2. Step 2: Convert to fraction form
    390,110.57/585,334.88 = 137,571.50/x
  3. Step 3: Cross multiply
    390,110.57x = 585,334.88 × 137,571.50
  4. Step 4: Simplify right side
    390,110.57x = 80,525,393,829.39
  5. Step 5: Solve for x
    x = 80,525,393,829.39/390,110.57
  6. Step 6: Final answer
    x = 206,416.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.