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Finding the Fourth Proportional to 390,030.80, 585,046.20 and 248,313.20

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Solution

The fourth proportional to 390,030.80, 585,046.20 and 248,313.20 is: 372,469.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,030.80 : 585,046.20 = 248,313.20 : x
  2. Step 2: Convert to fraction form
    390,030.80/585,046.20 = 248,313.20/x
  3. Step 3: Cross multiply
    390,030.80x = 585,046.20 × 248,313.20
  4. Step 4: Simplify right side
    390,030.80x = 145,274,694,069.84
  5. Step 5: Solve for x
    x = 145,274,694,069.84/390,030.80
  6. Step 6: Final answer
    x = 372,469.80

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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.