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Finding the Fourth Proportional to 405,019.80, 606,654.90 and 217,812.60

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Solution

The fourth proportional to 405,019.80, 606,654.90 and 217,812.60 is: 326,248.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,019.80 : 606,654.90 = 217,812.60 : x
  2. Step 2: Convert to fraction form
    405,019.80/606,654.90 = 217,812.60/x
  3. Step 3: Cross multiply
    405,019.80x = 606,654.90 × 217,812.60
  4. Step 4: Simplify right side
    405,019.80x = 132,137,081,071.74
  5. Step 5: Solve for x
    x = 132,137,081,071.74/405,019.80
  6. Step 6: Final answer
    x = 326,248.45

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1.5x scale

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.