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Finding the Fourth Proportional to 738,658.55, 1,019,349.08 and 399,126.80

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Solution

The fourth proportional to 738,658.55, 1,019,349.08 and 399,126.80 is: 550,795.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    738,658.55 : 1,019,349.08 = 399,126.80 : x
  2. Step 2: Convert to fraction form
    738,658.55/1,019,349.08 = 399,126.80/x
  3. Step 3: Cross multiply
    738,658.55x = 1,019,349.08 × 399,126.80
  4. Step 4: Simplify right side
    738,658.55x = 406,849,529,290.97
  5. Step 5: Solve for x
    x = 406,849,529,290.97/738,658.55
  6. Step 6: Final answer
    x = 550,795.13

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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.