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Finding the Fourth Proportional to 613,422.40, 920,176.80 and 347,310.40

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Solution

The fourth proportional to 613,422.40, 920,176.80 and 347,310.40 is: 520,990.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    613,422.40 : 920,176.80 = 347,310.40 : x
  2. Step 2: Convert to fraction form
    613,422.40/920,176.80 = 347,310.40/x
  3. Step 3: Cross multiply
    613,422.40x = 920,176.80 × 347,310.40
  4. Step 4: Simplify right side
    613,422.40x = 319,586,972,478.72
  5. Step 5: Solve for x
    x = 319,586,972,478.72/613,422.40
  6. Step 6: Final answer
    x = 520,990.06

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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.