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Finding the Fourth Proportional to 390,443.60, 585,665.40 and 203,430.80

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Solution

The fourth proportional to 390,443.60, 585,665.40 and 203,430.80 is: 305,146.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,443.60 : 585,665.40 = 203,430.80 : x
  2. Step 2: Convert to fraction form
    390,443.60/585,665.40 = 203,430.80/x
  3. Step 3: Cross multiply
    390,443.60x = 585,665.40 × 203,430.80
  4. Step 4: Simplify right side
    390,443.60x = 119,142,380,854.32
  5. Step 5: Solve for x
    x = 119,142,380,854.32/390,443.60
  6. Step 6: Final answer
    x = 305,146.20

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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.