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Finding the Fourth Proportional to 910.66, 1,364 and 666.64

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Solution

The fourth proportional to 910.66, 1,364 and 666.64 is: 998.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.66 : 1,364 = 666.64 : x
  2. Step 2: Convert to fraction form
    910.66/1,364 = 666.64/x
  3. Step 3: Cross multiply
    910.66x = 1,364 × 666.64
  4. Step 4: Simplify right side
    910.66x = 909,296.96
  5. Step 5: Solve for x
    x = 909,296.96/910.66
  6. Step 6: Final answer
    x = 998.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.