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Finding the Fourth Proportional to 390,010.60, 538,186.98 and 220,234.60

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Solution

The fourth proportional to 390,010.60, 538,186.98 and 220,234.60 is: 303,908.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,010.60 : 538,186.98 = 220,234.60 : x
  2. Step 2: Convert to fraction form
    390,010.60/538,186.98 = 220,234.60/x
  3. Step 3: Cross multiply
    390,010.60x = 538,186.98 × 220,234.60
  4. Step 4: Simplify right side
    390,010.60x = 118,527,394,265.51
  5. Step 5: Solve for x
    x = 118,527,394,265.51/390,010.60
  6. Step 6: Final answer
    x = 303,908.14

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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.