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Finding the Fourth Proportional to 448.54, 619.76 and 389.06

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Solution

The fourth proportional to 448.54, 619.76 and 389.06 is: 537.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.54 : 619.76 = 389.06 : x
  2. Step 2: Convert to fraction form
    448.54/619.76 = 389.06/x
  3. Step 3: Cross multiply
    448.54x = 619.76 × 389.06
  4. Step 4: Simplify right side
    448.54x = 241,123.83
  5. Step 5: Solve for x
    x = 241,123.83/448.54
  6. Step 6: Final answer
    x = 537.57

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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.