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Finding the Fourth Proportional to 642,520.98, 886,685.49 and 356,047.38

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Solution

The fourth proportional to 642,520.98, 886,685.49 and 356,047.38 is: 491,349.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,520.98 : 886,685.49 = 356,047.38 : x
  2. Step 2: Convert to fraction form
    642,520.98/886,685.49 = 356,047.38/x
  3. Step 3: Cross multiply
    642,520.98x = 886,685.49 × 356,047.38
  4. Step 4: Simplify right side
    642,520.98x = 315,702,045,598.52
  5. Step 5: Solve for x
    x = 315,702,045,598.52/642,520.98
  6. Step 6: Final answer
    x = 491,349.01

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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.