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Finding the Fourth Proportional to 1,289.16, 1,779.50 and 765.19

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Solution

The fourth proportional to 1,289.16, 1,779.50 and 765.19 is: 1,056.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.16 : 1,779.50 = 765.19 : x
  2. Step 2: Convert to fraction form
    1,289.16/1,779.50 = 765.19/x
  3. Step 3: Cross multiply
    1,289.16x = 1,779.50 × 765.19
  4. Step 4: Simplify right side
    1,289.16x = 1,361,648.77
  5. Step 5: Solve for x
    x = 1,361,648.77/1,289.16
  6. Step 6: Final answer
    x = 1,056.23

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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.