Home / 128,779.10-177,716.47-71,419.56

Finding the Fourth Proportional to 128,779.10, 177,716.47 and 71,419.56

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Solution

The fourth proportional to 128,779.10, 177,716.47 and 71,419.56 is: 98,559.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.10 : 177,716.47 = 71,419.56 : x
  2. Step 2: Convert to fraction form
    128,779.10/177,716.47 = 71,419.56/x
  3. Step 3: Cross multiply
    128,779.10x = 177,716.47 × 71,419.56
  4. Step 4: Simplify right side
    128,779.10x = 12,692,432,482.34
  5. Step 5: Solve for x
    x = 12,692,432,482.34/128,779.10
  6. Step 6: Final answer
    x = 98,559.72

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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.