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Finding the Fourth Proportional to 285,607.60, 428,411.40 and 272,090.80

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Solution

The fourth proportional to 285,607.60, 428,411.40 and 272,090.80 is: 408,136.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,607.60 : 428,411.40 = 272,090.80 : x
  2. Step 2: Convert to fraction form
    285,607.60/428,411.40 = 272,090.80/x
  3. Step 3: Cross multiply
    285,607.60x = 428,411.40 × 272,090.80
  4. Step 4: Simplify right side
    285,607.60x = 116,566,800,555.12
  5. Step 5: Solve for x
    x = 116,566,800,555.12/285,607.60
  6. Step 6: Final answer
    x = 408,136.20

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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.