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Finding the Fourth Proportional to 611,122.90, 917,012.40 and 256,172.80

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Solution

The fourth proportional to 611,122.90, 917,012.40 and 256,172.80 is: 384,396.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,122.90 : 917,012.40 = 256,172.80 : x
  2. Step 2: Convert to fraction form
    611,122.90/917,012.40 = 256,172.80/x
  3. Step 3: Cross multiply
    611,122.90x = 917,012.40 × 256,172.80
  4. Step 4: Simplify right side
    611,122.90x = 234,913,634,142.72
  5. Step 5: Solve for x
    x = 234,913,634,142.72/611,122.90
  6. Step 6: Final answer
    x = 384,396.71

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1.5x scale

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.