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Finding the Fourth Proportional to 918.95, 1,270.15 and 672.03

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Solution

The fourth proportional to 918.95, 1,270.15 and 672.03 is: 928.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.95 : 1,270.15 = 672.03 : x
  2. Step 2: Convert to fraction form
    918.95/1,270.15 = 672.03/x
  3. Step 3: Cross multiply
    918.95x = 1,270.15 × 672.03
  4. Step 4: Simplify right side
    918.95x = 853,577.22
  5. Step 5: Solve for x
    x = 853,577.22/918.95
  6. Step 6: Final answer
    x = 928.87

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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.