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Finding the Fourth Proportional to 620,081.20, 930,121.80 and 578,090.80

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Solution

The fourth proportional to 620,081.20, 930,121.80 and 578,090.80 is: 867,136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,081.20 : 930,121.80 = 578,090.80 : x
  2. Step 2: Convert to fraction form
    620,081.20/930,121.80 = 578,090.80/x
  3. Step 3: Cross multiply
    620,081.20x = 930,121.80 × 578,090.80
  4. Step 4: Simplify right side
    620,081.20x = 537,694,855,459.44
  5. Step 5: Solve for x
    x = 537,694,855,459.44/620,081.20
  6. Step 6: Final answer
    x = 867,136.20

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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.