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Finding the Fourth Proportional to 128,421.64, 177,271.54 and 114,969.54

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Solution

The fourth proportional to 128,421.64, 177,271.54 and 114,969.54 is: 158,702.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,421.64 : 177,271.54 = 114,969.54 : x
  2. Step 2: Convert to fraction form
    128,421.64/177,271.54 = 114,969.54/x
  3. Step 3: Cross multiply
    128,421.64x = 177,271.54 × 114,969.54
  4. Step 4: Simplify right side
    128,421.64x = 20,380,827,786.24
  5. Step 5: Solve for x
    x = 20,380,827,786.24/128,421.64
  6. Step 6: Final answer
    x = 158,702.44

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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.