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Finding the Fourth Proportional to 1,289.06, 1,779.10 and 846.20

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Solution

The fourth proportional to 1,289.06, 1,779.10 and 846.20 is: 1,167.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.06 : 1,779.10 = 846.20 : x
  2. Step 2: Convert to fraction form
    1,289.06/1,779.10 = 846.20/x
  3. Step 3: Cross multiply
    1,289.06x = 1,779.10 × 846.20
  4. Step 4: Simplify right side
    1,289.06x = 1,505,474.42
  5. Step 5: Solve for x
    x = 1,505,474.42/1,289.06
  6. Step 6: Final answer
    x = 1,167.89

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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.