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Finding the Fourth Proportional to 611,371.90, 917,385.90 and 256,421.80

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Solution

The fourth proportional to 611,371.90, 917,385.90 and 256,421.80 is: 384,770.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,371.90 : 917,385.90 = 256,421.80 : x
  2. Step 2: Convert to fraction form
    611,371.90/917,385.90 = 256,421.80/x
  3. Step 3: Cross multiply
    611,371.90x = 917,385.90 × 256,421.80
  4. Step 4: Simplify right side
    611,371.90x = 235,237,743,772.62
  5. Step 5: Solve for x
    x = 235,237,743,772.62/611,371.90
  6. Step 6: Final answer
    x = 384,770.29

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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.