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Finding the Fourth Proportional to 1,289.18, 1,779.07 and 699.71

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Solution

The fourth proportional to 1,289.18, 1,779.07 and 699.71 is: 965.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.18 : 1,779.07 = 699.71 : x
  2. Step 2: Convert to fraction form
    1,289.18/1,779.07 = 699.71/x
  3. Step 3: Cross multiply
    1,289.18x = 1,779.07 × 699.71
  4. Step 4: Simplify right side
    1,289.18x = 1,244,835.67
  5. Step 5: Solve for x
    x = 1,244,835.67/1,289.18
  6. Step 6: Final answer
    x = 965.60

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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.