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Finding the Fourth Proportional to 620,374.20, 930,561.30 and 407,797.80

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Solution

The fourth proportional to 620,374.20, 930,561.30 and 407,797.80 is: 611,696.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,374.20 : 930,561.30 = 407,797.80 : x
  2. Step 2: Convert to fraction form
    620,374.20/930,561.30 = 407,797.80/x
  3. Step 3: Cross multiply
    620,374.20x = 930,561.30 × 407,797.80
  4. Step 4: Simplify right side
    620,374.20x = 379,480,850,905.14
  5. Step 5: Solve for x
    x = 379,480,850,905.14/620,374.20
  6. Step 6: Final answer
    x = 611,696.70

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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.