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Finding the Fourth Proportional to 975.70, 1,461.60 and 666.78

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Solution

The fourth proportional to 975.70, 1,461.60 and 666.78 is: 998.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.70 : 1,461.60 = 666.78 : x
  2. Step 2: Convert to fraction form
    975.70/1,461.60 = 666.78/x
  3. Step 3: Cross multiply
    975.70x = 1,461.60 × 666.78
  4. Step 4: Simplify right side
    975.70x = 974,562.31
  5. Step 5: Solve for x
    x = 974,562.31/975.70
  6. Step 6: Final answer
    x = 998.84

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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.