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Finding the Fourth Proportional to 1,085.36, 1,497.72 and 665.71

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Solution

The fourth proportional to 1,085.36, 1,497.72 and 665.71 is: 918.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.36 : 1,497.72 = 665.71 : x
  2. Step 2: Convert to fraction form
    1,085.36/1,497.72 = 665.71/x
  3. Step 3: Cross multiply
    1,085.36x = 1,497.72 × 665.71
  4. Step 4: Simplify right side
    1,085.36x = 997,045.93
  5. Step 5: Solve for x
    x = 997,045.93/1,085.36
  6. Step 6: Final answer
    x = 918.64

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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.