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Finding the Fourth Proportional to 1,779.64, 2,455.90 and 993.68

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Solution

The fourth proportional to 1,779.64, 2,455.90 and 993.68 is: 1,371.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,779.64 : 2,455.90 = 993.68 : x
  2. Step 2: Convert to fraction form
    1,779.64/2,455.90 = 993.68/x
  3. Step 3: Cross multiply
    1,779.64x = 2,455.90 × 993.68
  4. Step 4: Simplify right side
    1,779.64x = 2,440,386.97
  5. Step 5: Solve for x
    x = 2,440,386.97/1,779.64
  6. Step 6: Final answer
    x = 1,371.28

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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.