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Finding the Fourth Proportional to 445,387.80, 668,081.70 and 390,091.80

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Solution

The fourth proportional to 445,387.80, 668,081.70 and 390,091.80 is: 585,137.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    445,387.80 : 668,081.70 = 390,091.80 : x
  2. Step 2: Convert to fraction form
    445,387.80/668,081.70 = 390,091.80/x
  3. Step 3: Cross multiply
    445,387.80x = 668,081.70 × 390,091.80
  4. Step 4: Simplify right side
    445,387.80x = 260,613,192,900.06
  5. Step 5: Solve for x
    x = 260,613,192,900.06/445,387.80
  6. Step 6: Final answer
    x = 585,137.70

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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.