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Finding the Fourth Proportional to 1,222.38, 1,690.02 and 927.18

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Solution

The fourth proportional to 1,222.38, 1,690.02 and 927.18 is: 1,281.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.38 : 1,690.02 = 927.18 : x
  2. Step 2: Convert to fraction form
    1,222.38/1,690.02 = 927.18/x
  3. Step 3: Cross multiply
    1,222.38x = 1,690.02 × 927.18
  4. Step 4: Simplify right side
    1,222.38x = 1,566,952.74
  5. Step 5: Solve for x
    x = 1,566,952.74/1,222.38
  6. Step 6: Final answer
    x = 1,281.89

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1.5x scale

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.