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Finding the Fourth Proportional to 128,420.30, 179,438.50 and 128,420.30

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Solution

The fourth proportional to 128,420.30, 179,438.50 and 128,420.30 is: 179,438.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,420.30 : 179,438.50 = 128,420.30 : x
  2. Step 2: Convert to fraction form
    128,420.30/179,438.50 = 128,420.30/x
  3. Step 3: Cross multiply
    128,420.30x = 179,438.50 × 128,420.30
  4. Step 4: Simplify right side
    128,420.30x = 23,043,546,001.55
  5. Step 5: Solve for x
    x = 23,043,546,001.55/128,420.30
  6. Step 6: Final answer
    x = 179,438.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.