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Finding the Fourth Proportional to 628.57, 867.53 and 389.41

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Solution

The fourth proportional to 628.57, 867.53 and 389.41 is: 537.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.57 : 867.53 = 389.41 : x
  2. Step 2: Convert to fraction form
    628.57/867.53 = 389.41/x
  3. Step 3: Cross multiply
    628.57x = 867.53 × 389.41
  4. Step 4: Simplify right side
    628.57x = 337,824.86
  5. Step 5: Solve for x
    x = 337,824.86/628.57
  6. Step 6: Final answer
    x = 537.45

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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.