Home / 642,130.20-886,090.90-355,644.13

Finding the Fourth Proportional to 642,130.20, 886,090.90 and 355,644.13

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Solution

The fourth proportional to 642,130.20, 886,090.90 and 355,644.13 is: 490,761.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,130.20 : 886,090.90 = 355,644.13 : x
  2. Step 2: Convert to fraction form
    642,130.20/886,090.90 = 355,644.13/x
  3. Step 3: Cross multiply
    642,130.20x = 886,090.90 × 355,644.13
  4. Step 4: Simplify right side
    642,130.20x = 315,133,027,951.46
  5. Step 5: Solve for x
    x = 315,133,027,951.46/642,130.20
  6. Step 6: Final answer
    x = 490,761.89

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.