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Finding the Fourth Proportional to 642,496.75, 886,664.96 and 355,990.03

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Solution

The fourth proportional to 642,496.75, 886,664.96 and 355,990.03 is: 491,277.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,496.75 : 886,664.96 = 355,990.03 : x
  2. Step 2: Convert to fraction form
    642,496.75/886,664.96 = 355,990.03/x
  3. Step 3: Cross multiply
    642,496.75x = 886,664.96 × 355,990.03
  4. Step 4: Simplify right side
    642,496.75x = 315,643,883,930.40
  5. Step 5: Solve for x
    x = 315,643,883,930.40/642,496.75
  6. Step 6: Final answer
    x = 491,277.01

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Double scale
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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.