Home / 642,121.21-886,133.78-387,423.19

Finding the Fourth Proportional to 642,121.21, 886,133.78 and 387,423.19

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Solution

The fourth proportional to 642,121.21, 886,133.78 and 387,423.19 is: 534,647.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,121.21 : 886,133.78 = 387,423.19 : x
  2. Step 2: Convert to fraction form
    642,121.21/886,133.78 = 387,423.19/x
  3. Step 3: Cross multiply
    642,121.21x = 886,133.78 × 387,423.19
  4. Step 4: Simplify right side
    642,121.21x = 343,308,773,114.75
  5. Step 5: Solve for x
    x = 343,308,773,114.75/642,121.21
  6. Step 6: Final answer
    x = 534,647.93

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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.