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Finding the Fourth Proportional to 1,187.00, 1,779.75 and 455.70

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Solution

The fourth proportional to 1,187.00, 1,779.75 and 455.70 is: 683.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.00 : 1,779.75 = 455.70 : x
  2. Step 2: Convert to fraction form
    1,187.00/1,779.75 = 455.70/x
  3. Step 3: Cross multiply
    1,187.00x = 1,779.75 × 455.70
  4. Step 4: Simplify right side
    1,187.00x = 811,032.08
  5. Step 5: Solve for x
    x = 811,032.08/1,187.00
  6. Step 6: Final answer
    x = 683.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.