Home / 128,779.06-177,714.39-72,189.22

Finding the Fourth Proportional to 128,779.06, 177,714.39 and 72,189.22

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Solution

The fourth proportional to 128,779.06, 177,714.39 and 72,189.22 is: 99,620.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.06 : 177,714.39 = 72,189.22 : x
  2. Step 2: Convert to fraction form
    128,779.06/177,714.39 = 72,189.22/x
  3. Step 3: Cross multiply
    128,779.06x = 177,714.39 × 72,189.22
  4. Step 4: Simplify right side
    128,779.06x = 12,829,063,196.88
  5. Step 5: Solve for x
    x = 12,829,063,196.88/128,779.06
  6. Step 6: Final answer
    x = 99,620.72

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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.