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Finding the Fourth Proportional to 128,980.34, 178,004.04 and 71,630.72

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Solution

The fourth proportional to 128,980.34, 178,004.04 and 71,630.72 is: 98,856.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,980.34 : 178,004.04 = 71,630.72 : x
  2. Step 2: Convert to fraction form
    128,980.34/178,004.04 = 71,630.72/x
  3. Step 3: Cross multiply
    128,980.34x = 178,004.04 × 71,630.72
  4. Step 4: Simplify right side
    128,980.34x = 12,750,557,548.11
  5. Step 5: Solve for x
    x = 12,750,557,548.11/128,980.34
  6. Step 6: Final answer
    x = 98,856.60

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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.