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Finding the Fourth Proportional to 611,691.20, 917,099.40 and 274,455.80

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Solution

The fourth proportional to 611,691.20, 917,099.40 and 274,455.80 is: 411,487.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,691.20 : 917,099.40 = 274,455.80 : x
  2. Step 2: Convert to fraction form
    611,691.20/917,099.40 = 274,455.80/x
  3. Step 3: Cross multiply
    611,691.20x = 917,099.40 × 274,455.80
  4. Step 4: Simplify right side
    611,691.20x = 251,703,249,506.52
  5. Step 5: Solve for x
    x = 251,703,249,506.52/611,691.20
  6. Step 6: Final answer
    x = 411,487.45

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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.