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Finding the Fourth Proportional to 946.81, 1,420.20 and 391.51

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Solution

The fourth proportional to 946.81, 1,420.20 and 391.51 is: 587.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    946.81 : 1,420.20 = 391.51 : x
  2. Step 2: Convert to fraction form
    946.81/1,420.20 = 391.51/x
  3. Step 3: Cross multiply
    946.81x = 1,420.20 × 391.51
  4. Step 4: Simplify right side
    946.81x = 556,022.50
  5. Step 5: Solve for x
    x = 556,022.50/946.81
  6. Step 6: Final answer
    x = 587.26

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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.