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Finding the Fourth Proportional to 128,115.60, 191,719.80 and 111,656.40

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Solution

The fourth proportional to 128,115.60, 191,719.80 and 111,656.40 is: 167,089.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,115.60 : 191,719.80 = 111,656.40 : x
  2. Step 2: Convert to fraction form
    128,115.60/191,719.80 = 111,656.40/x
  3. Step 3: Cross multiply
    128,115.60x = 191,719.80 × 111,656.40
  4. Step 4: Simplify right side
    128,115.60x = 21,406,742,676.72
  5. Step 5: Solve for x
    x = 21,406,742,676.72/128,115.60
  6. Step 6: Final answer
    x = 167,089.27

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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.