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Finding the Fourth Proportional to 642,089.79, 886,093.53 and 351,728.10

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Solution

The fourth proportional to 642,089.79, 886,093.53 and 351,728.10 is: 485,390.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,089.79 : 886,093.53 = 351,728.10 : x
  2. Step 2: Convert to fraction form
    642,089.79/886,093.53 = 351,728.10/x
  3. Step 3: Cross multiply
    642,089.79x = 886,093.53 × 351,728.10
  4. Step 4: Simplify right side
    642,089.79x = 311,663,993,729.19
  5. Step 5: Solve for x
    x = 311,663,993,729.19/642,089.79
  6. Step 6: Final answer
    x = 485,390.05

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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.