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Finding the Fourth Proportional to 1,246.72, 1,870.40 and 381.03

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Solution

The fourth proportional to 1,246.72, 1,870.40 and 381.03 is: 571.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,246.72 : 1,870.40 = 381.03 : x
  2. Step 2: Convert to fraction form
    1,246.72/1,870.40 = 381.03/x
  3. Step 3: Cross multiply
    1,246.72x = 1,870.40 × 381.03
  4. Step 4: Simplify right side
    1,246.72x = 712,678.51
  5. Step 5: Solve for x
    x = 712,678.51/1,246.72
  6. Step 6: Final answer
    x = 571.64

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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.