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Finding the Fourth Proportional to 981.16, 1,353.49 and 666.32

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Solution

The fourth proportional to 981.16, 1,353.49 and 666.32 is: 919.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.16 : 1,353.49 = 666.32 : x
  2. Step 2: Convert to fraction form
    981.16/1,353.49 = 666.32/x
  3. Step 3: Cross multiply
    981.16x = 1,353.49 × 666.32
  4. Step 4: Simplify right side
    981.16x = 901,857.46
  5. Step 5: Solve for x
    x = 901,857.46/981.16
  6. Step 6: Final answer
    x = 919.18

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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.