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Finding the Fourth Proportional to 100,779.36, 139,078.80 and 55,460.60

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Solution

The fourth proportional to 100,779.36, 139,078.80 and 55,460.60 is: 76,537.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,779.36 : 139,078.80 = 55,460.60 : x
  2. Step 2: Convert to fraction form
    100,779.36/139,078.80 = 55,460.60/x
  3. Step 3: Cross multiply
    100,779.36x = 139,078.80 × 55,460.60
  4. Step 4: Simplify right side
    100,779.36x = 7,713,393,695.28
  5. Step 5: Solve for x
    x = 7,713,393,695.28/100,779.36
  6. Step 6: Final answer
    x = 76,537.43

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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.