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Finding the Fourth Proportional to 840.84, 1,260.71 and 666.89

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Solution

The fourth proportional to 840.84, 1,260.71 and 666.89 is: 999.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.84 : 1,260.71 = 666.89 : x
  2. Step 2: Convert to fraction form
    840.84/1,260.71 = 666.89/x
  3. Step 3: Cross multiply
    840.84x = 1,260.71 × 666.89
  4. Step 4: Simplify right side
    840.84x = 840,754.89
  5. Step 5: Solve for x
    x = 840,754.89/840.84
  6. Step 6: Final answer
    x = 999.90

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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.