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Finding the Fourth Proportional to 1,506.11, 2,078.58 and 947

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Solution

The fourth proportional to 1,506.11, 2,078.58 and 947 is: 1,306.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,506.11 : 2,078.58 = 947 : x
  2. Step 2: Convert to fraction form
    1,506.11/2,078.58 = 947/x
  3. Step 3: Cross multiply
    1,506.11x = 2,078.58 × 947
  4. Step 4: Simplify right side
    1,506.11x = 1,968,415.26
  5. Step 5: Solve for x
    x = 1,968,415.26/1,506.11
  6. Step 6: Final answer
    x = 1,306.95

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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.