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Finding the Fourth Proportional to 128,370.76, 177,147.88 and 71,012.36

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Solution

The fourth proportional to 128,370.76, 177,147.88 and 71,012.36 is: 97,994.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,370.76 : 177,147.88 = 71,012.36 : x
  2. Step 2: Convert to fraction form
    128,370.76/177,147.88 = 71,012.36/x
  3. Step 3: Cross multiply
    128,370.76x = 177,147.88 × 71,012.36
  4. Step 4: Simplify right side
    128,370.76x = 12,579,689,293.14
  5. Step 5: Solve for x
    x = 12,579,689,293.14/128,370.76
  6. Step 6: Final answer
    x = 97,994.98

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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.