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Finding the Fourth Proportional to 485,020.40, 727,962.60 and 285,090.80

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Solution

The fourth proportional to 485,020.40, 727,962.60 and 285,090.80 is: 427,890.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,020.40 : 727,962.60 = 285,090.80 : x
  2. Step 2: Convert to fraction form
    485,020.40/727,962.60 = 285,090.80/x
  3. Step 3: Cross multiply
    485,020.40x = 727,962.60 × 285,090.80
  4. Step 4: Simplify right side
    485,020.40x = 207,535,440,004.08
  5. Step 5: Solve for x
    x = 207,535,440,004.08/485,020.40
  6. Step 6: Final answer
    x = 427,890.13

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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.