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Finding the Fourth Proportional to 918.51, 1,267.19 and 720.11

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Solution

The fourth proportional to 918.51, 1,267.19 and 720.11 is: 993.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.51 : 1,267.19 = 720.11 : x
  2. Step 2: Convert to fraction form
    918.51/1,267.19 = 720.11/x
  3. Step 3: Cross multiply
    918.51x = 1,267.19 × 720.11
  4. Step 4: Simplify right side
    918.51x = 912,515.38
  5. Step 5: Solve for x
    x = 912,515.38/918.51
  6. Step 6: Final answer
    x = 993.48

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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.