Home / 128,790.41-177,732.23-71,430.86

Finding the Fourth Proportional to 128,790.41, 177,732.23 and 71,430.86

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Solution

The fourth proportional to 128,790.41, 177,732.23 and 71,430.86 is: 98,575.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,790.41 : 177,732.23 = 71,430.86 : x
  2. Step 2: Convert to fraction form
    128,790.41/177,732.23 = 71,430.86/x
  3. Step 3: Cross multiply
    128,790.41x = 177,732.23 × 71,430.86
  4. Step 4: Simplify right side
    128,790.41x = 12,695,566,125.79
  5. Step 5: Solve for x
    x = 12,695,566,125.79/128,790.41
  6. Step 6: Final answer
    x = 98,575.40

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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.