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Finding the Fourth Proportional to 1,289.66, 1,779.44 and 870.78

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Solution

The fourth proportional to 1,289.66, 1,779.44 and 870.78 is: 1,201.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.66 : 1,779.44 = 870.78 : x
  2. Step 2: Convert to fraction form
    1,289.66/1,779.44 = 870.78/x
  3. Step 3: Cross multiply
    1,289.66x = 1,779.44 × 870.78
  4. Step 4: Simplify right side
    1,289.66x = 1,549,500.76
  5. Step 5: Solve for x
    x = 1,549,500.76/1,289.66
  6. Step 6: Final answer
    x = 1,201.48

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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.