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Finding the Fourth Proportional to 1,291.86, 1,780.00 and 1,185.70

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Solution

The fourth proportional to 1,291.86, 1,780.00 and 1,185.70 is: 1,633.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.86 : 1,780.00 = 1,185.70 : x
  2. Step 2: Convert to fraction form
    1,291.86/1,780.00 = 1,185.70/x
  3. Step 3: Cross multiply
    1,291.86x = 1,780.00 × 1,185.70
  4. Step 4: Simplify right side
    1,291.86x = 2,110,538.59
  5. Step 5: Solve for x
    x = 2,110,538.59/1,291.86
  6. Step 6: Final answer
    x = 1,633.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.