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Finding the Fourth Proportional to 1,302.75, 1,954.13 and 390.75

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Solution

The fourth proportional to 1,302.75, 1,954.13 and 390.75 is: 586.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,302.75 : 1,954.13 = 390.75 : x
  2. Step 2: Convert to fraction form
    1,302.75/1,954.13 = 390.75/x
  3. Step 3: Cross multiply
    1,302.75x = 1,954.13 × 390.75
  4. Step 4: Simplify right side
    1,302.75x = 763,574.34
  5. Step 5: Solve for x
    x = 763,574.34/1,302.75
  6. Step 6: Final answer
    x = 586.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.