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Finding the Fourth Proportional to 666.36, 918.54 and 653.40

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Solution

The fourth proportional to 666.36, 918.54 and 653.40 is: 900.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.36 : 918.54 = 653.40 : x
  2. Step 2: Convert to fraction form
    666.36/918.54 = 653.40/x
  3. Step 3: Cross multiply
    666.36x = 918.54 × 653.40
  4. Step 4: Simplify right side
    666.36x = 600,174.04
  5. Step 5: Solve for x
    x = 600,174.04/666.36
  6. Step 6: Final answer
    x = 900.68

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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.