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Finding the Fourth Proportional to 1,281.90, 1,923.88 and 666.12

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Solution

The fourth proportional to 1,281.90, 1,923.88 and 666.12 is: 999.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.90 : 1,923.88 = 666.12 : x
  2. Step 2: Convert to fraction form
    1,281.90/1,923.88 = 666.12/x
  3. Step 3: Cross multiply
    1,281.90x = 1,923.88 × 666.12
  4. Step 4: Simplify right side
    1,281.90x = 1,281,539.87
  5. Step 5: Solve for x
    x = 1,281,539.87/1,281.90
  6. Step 6: Final answer
    x = 999.72

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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.