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Finding the Fourth Proportional to 390,009.60, 538,185.60 and 220,233.60

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Solution

The fourth proportional to 390,009.60, 538,185.60 and 220,233.60 is: 303,906.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,009.60 : 538,185.60 = 220,233.60 : x
  2. Step 2: Convert to fraction form
    390,009.60/538,185.60 = 220,233.60/x
  3. Step 3: Cross multiply
    390,009.60x = 538,185.60 × 220,233.60
  4. Step 4: Simplify right side
    390,009.60x = 118,526,552,156.16
  5. Step 5: Solve for x
    x = 118,526,552,156.16/390,009.60
  6. Step 6: Final answer
    x = 303,906.76

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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.