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Finding the Fourth Proportional to 235,814.40, 325,429.76 and 128,390.32

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Solution

The fourth proportional to 235,814.40, 325,429.76 and 128,390.32 is: 177,181.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    235,814.40 : 325,429.76 = 128,390.32 : x
  2. Step 2: Convert to fraction form
    235,814.40/325,429.76 = 128,390.32/x
  3. Step 3: Cross multiply
    235,814.40x = 325,429.76 × 128,390.32
  4. Step 4: Simplify right side
    235,814.40x = 41,782,031,023.92
  5. Step 5: Solve for x
    x = 41,782,031,023.92/235,814.40
  6. Step 6: Final answer
    x = 177,181.85

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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.