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Finding the Fourth Proportional to 128,779.56, 177,715.08 and 72,189.72

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Solution

The fourth proportional to 128,779.56, 177,715.08 and 72,189.72 is: 99,621.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,779.56 : 177,715.08 = 72,189.72 : x
  2. Step 2: Convert to fraction form
    128,779.56/177,715.08 = 72,189.72/x
  3. Step 3: Cross multiply
    128,779.56x = 177,715.08 × 72,189.72
  4. Step 4: Simplify right side
    128,779.56x = 12,829,201,864.98
  5. Step 5: Solve for x
    x = 12,829,201,864.98/128,779.56
  6. Step 6: Final answer
    x = 99,621.41

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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.