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Finding the Fourth Proportional to 611,138.80, 918,090.60 and 424,514.80

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Solution

The fourth proportional to 611,138.80, 918,090.60 and 424,514.80 is: 637,732.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,138.80 : 918,090.60 = 424,514.80 : x
  2. Step 2: Convert to fraction form
    611,138.80/918,090.60 = 424,514.80/x
  3. Step 3: Cross multiply
    611,138.80x = 918,090.60 × 424,514.80
  4. Step 4: Simplify right side
    611,138.80x = 389,743,047,440.88
  5. Step 5: Solve for x
    x = 389,743,047,440.88/611,138.80
  6. Step 6: Final answer
    x = 637,732.46

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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.