Home / 128,905.10-193,357.65-69,856.10

Finding the Fourth Proportional to 128,905.10, 193,357.65 and 69,856.10

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Solution

The fourth proportional to 128,905.10, 193,357.65 and 69,856.10 is: 104,784.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,905.10 : 193,357.65 = 69,856.10 : x
  2. Step 2: Convert to fraction form
    128,905.10/193,357.65 = 69,856.10/x
  3. Step 3: Cross multiply
    128,905.10x = 193,357.65 × 69,856.10
  4. Step 4: Simplify right side
    128,905.10x = 13,507,211,334.17
  5. Step 5: Solve for x
    x = 13,507,211,334.17/128,905.10
  6. Step 6: Final answer
    x = 104,784.15

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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.