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Finding the Fourth Proportional to 860.66, 1,291.61 and 666.15

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Solution

The fourth proportional to 860.66, 1,291.61 and 666.15 is: 999.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    860.66 : 1,291.61 = 666.15 : x
  2. Step 2: Convert to fraction form
    860.66/1,291.61 = 666.15/x
  3. Step 3: Cross multiply
    860.66x = 1,291.61 × 666.15
  4. Step 4: Simplify right side
    860.66x = 860,406.00
  5. Step 5: Solve for x
    x = 860,406.00/860.66
  6. Step 6: Final answer
    x = 999.70

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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.