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Finding the Fourth Proportional to 1,289.80, 1,779.95 and 792.15

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Solution

The fourth proportional to 1,289.80, 1,779.95 and 792.15 is: 1,093.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.80 : 1,779.95 = 792.15 : x
  2. Step 2: Convert to fraction form
    1,289.80/1,779.95 = 792.15/x
  3. Step 3: Cross multiply
    1,289.80x = 1,779.95 × 792.15
  4. Step 4: Simplify right side
    1,289.80x = 1,409,983.43
  5. Step 5: Solve for x
    x = 1,409,983.43/1,289.80
  6. Step 6: Final answer
    x = 1,093.18

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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.