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Finding the Fourth Proportional to 128,768.58, 177,718.86 and 71,420.58

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Solution

The fourth proportional to 128,768.58, 177,718.86 and 71,420.58 is: 98,570.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,768.58 : 177,718.86 = 71,420.58 : x
  2. Step 2: Convert to fraction form
    128,768.58/177,718.86 = 71,420.58/x
  3. Step 3: Cross multiply
    128,768.58x = 177,718.86 × 71,420.58
  4. Step 4: Simplify right side
    128,768.58x = 12,692,784,058.14
  5. Step 5: Solve for x
    x = 12,692,784,058.14/128,768.58
  6. Step 6: Final answer
    x = 98,570.51

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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.