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Finding the Fourth Proportional to 128,051.55, 176,728.95 and 71,466.57

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Solution

The fourth proportional to 128,051.55, 176,728.95 and 71,466.57 is: 98,633.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,051.55 : 176,728.95 = 71,466.57 : x
  2. Step 2: Convert to fraction form
    128,051.55/176,728.95 = 71,466.57/x
  3. Step 3: Cross multiply
    128,051.55x = 176,728.95 × 71,466.57
  4. Step 4: Simplify right side
    128,051.55x = 12,630,211,876.20
  5. Step 5: Solve for x
    x = 12,630,211,876.20/128,051.55
  6. Step 6: Final answer
    x = 98,633.81

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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.