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Finding the Fourth Proportional to 642,573.47, 962,808.73 and 389,086.20

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Solution

The fourth proportional to 642,573.47, 962,808.73 and 389,086.20 is: 582,992.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,573.47 : 962,808.73 = 389,086.20 : x
  2. Step 2: Convert to fraction form
    642,573.47/962,808.73 = 389,086.20/x
  3. Step 3: Cross multiply
    642,573.47x = 962,808.73 × 389,086.20
  4. Step 4: Simplify right side
    642,573.47x = 374,615,589,109.81
  5. Step 5: Solve for x
    x = 374,615,589,109.81/642,573.47
  6. Step 6: Final answer
    x = 582,992.62

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Double scale
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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.