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Finding the Fourth Proportional to 620,405.20, 930,607.80 and 407,828.80

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Solution

The fourth proportional to 620,405.20, 930,607.80 and 407,828.80 is: 611,743.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,405.20 : 930,607.80 = 407,828.80 : x
  2. Step 2: Convert to fraction form
    620,405.20/930,607.80 = 407,828.80/x
  3. Step 3: Cross multiply
    620,405.20x = 930,607.80 × 407,828.80
  4. Step 4: Simplify right side
    620,405.20x = 379,528,662,344.64
  5. Step 5: Solve for x
    x = 379,528,662,344.64/620,405.20
  6. Step 6: Final answer
    x = 611,743.20

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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.