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Finding the Fourth Proportional to 691,440, 954,187.20 and 389,644.80

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Solution

The fourth proportional to 691,440, 954,187.20 and 389,644.80 is: 537,709.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,440 : 954,187.20 = 389,644.80 : x
  2. Step 2: Convert to fraction form
    691,440/954,187.20 = 389,644.80/x
  3. Step 3: Cross multiply
    691,440x = 954,187.20 × 389,644.80
  4. Step 4: Simplify right side
    691,440x = 371,794,080,706.56
  5. Step 5: Solve for x
    x = 371,794,080,706.56/691,440
  6. Step 6: Final answer
    x = 537,709.82

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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.