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Finding the Fourth Proportional to 390,670.20, 584,450.10 and 338,657.40

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Solution

The fourth proportional to 390,670.20, 584,450.10 and 338,657.40 is: 506,637.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,670.20 : 584,450.10 = 338,657.40 : x
  2. Step 2: Convert to fraction form
    390,670.20/584,450.10 = 338,657.40/x
  3. Step 3: Cross multiply
    390,670.20x = 584,450.10 × 338,657.40
  4. Step 4: Simplify right side
    390,670.20x = 197,928,351,295.74
  5. Step 5: Solve for x
    x = 197,928,351,295.74/390,670.20
  6. Step 6: Final answer
    x = 506,637.96

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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.