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Finding the Fourth Proportional to 448.64, 619.14 and 389.17

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Solution

The fourth proportional to 448.64, 619.14 and 389.17 is: 537.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.64 : 619.14 = 389.17 : x
  2. Step 2: Convert to fraction form
    448.64/619.14 = 389.17/x
  3. Step 3: Cross multiply
    448.64x = 619.14 × 389.17
  4. Step 4: Simplify right side
    448.64x = 240,950.71
  5. Step 5: Solve for x
    x = 240,950.71/448.64
  6. Step 6: Final answer
    x = 537.07

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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.