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Finding the Fourth Proportional to 128,098.36, 176,775.72 and 71,509.74

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Solution

The fourth proportional to 128,098.36, 176,775.72 and 71,509.74 is: 98,683.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,098.36 : 176,775.72 = 71,509.74 : x
  2. Step 2: Convert to fraction form
    128,098.36/176,775.72 = 71,509.74/x
  3. Step 3: Cross multiply
    128,098.36x = 176,775.72 × 71,509.74
  4. Step 4: Simplify right side
    128,098.36x = 12,641,184,844.44
  5. Step 5: Solve for x
    x = 12,641,184,844.44/128,098.36
  6. Step 6: Final answer
    x = 98,683.42

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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.