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Finding the Fourth Proportional to 1,291.24, 1,936 and 666.93

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Solution

The fourth proportional to 1,291.24, 1,936 and 666.93 is: 999.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.24 : 1,936 = 666.93 : x
  2. Step 2: Convert to fraction form
    1,291.24/1,936 = 666.93/x
  3. Step 3: Cross multiply
    1,291.24x = 1,936 × 666.93
  4. Step 4: Simplify right side
    1,291.24x = 1,291,176.48
  5. Step 5: Solve for x
    x = 1,291,176.48/1,291.24
  6. Step 6: Final answer
    x = 999.95

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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.