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Finding the Fourth Proportional to 515,382.75, 711,228.60 and 289,028.25

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Solution

The fourth proportional to 515,382.75, 711,228.60 and 289,028.25 is: 398,859.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,382.75 : 711,228.60 = 289,028.25 : x
  2. Step 2: Convert to fraction form
    515,382.75/711,228.60 = 289,028.25/x
  3. Step 3: Cross multiply
    515,382.75x = 711,228.60 × 289,028.25
  4. Step 4: Simplify right side
    515,382.75x = 205,565,157,607.95
  5. Step 5: Solve for x
    x = 205,565,157,607.95/515,382.75
  6. Step 6: Final answer
    x = 398,859.21

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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.