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Finding the Fourth Proportional to 674,045.66, 930,205.97 and 398,639.60

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Solution

The fourth proportional to 674,045.66, 930,205.97 and 398,639.60 is: 550,136.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    674,045.66 : 930,205.97 = 398,639.60 : x
  2. Step 2: Convert to fraction form
    674,045.66/930,205.97 = 398,639.60/x
  3. Step 3: Cross multiply
    674,045.66x = 930,205.97 × 398,639.60
  4. Step 4: Simplify right side
    674,045.66x = 370,816,935,009.42
  5. Step 5: Solve for x
    x = 370,816,935,009.42/674,045.66
  6. Step 6: Final answer
    x = 550,136.22

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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.