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Finding the Fourth Proportional to 128,290.50, 177,044.94 and 71,701.74

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Solution

The fourth proportional to 128,290.50, 177,044.94 and 71,701.74 is: 98,950.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,290.50 : 177,044.94 = 71,701.74 : x
  2. Step 2: Convert to fraction form
    128,290.50/177,044.94 = 71,701.74/x
  3. Step 3: Cross multiply
    128,290.50x = 177,044.94 × 71,701.74
  4. Step 4: Simplify right side
    128,290.50x = 12,694,430,256.20
  5. Step 5: Solve for x
    x = 12,694,430,256.20/128,290.50
  6. Step 6: Final answer
    x = 98,950.66

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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.