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Finding the Fourth Proportional to 138,779.60, 208,266.60 and 88,980.80

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Solution

The fourth proportional to 138,779.60, 208,266.60 and 88,980.80 is: 133,533.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,779.60 : 208,266.60 = 88,980.80 : x
  2. Step 2: Convert to fraction form
    138,779.60/208,266.60 = 88,980.80/x
  3. Step 3: Cross multiply
    138,779.60x = 208,266.60 × 88,980.80
  4. Step 4: Simplify right side
    138,779.60x = 18,531,728,681.28
  5. Step 5: Solve for x
    x = 18,531,728,681.28/138,779.60
  6. Step 6: Final answer
    x = 133,533.52

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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.