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Finding the Fourth Proportional to 120,128.40, 179,933.40 and 99,392.40

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Solution

The fourth proportional to 120,128.40, 179,933.40 and 99,392.40 is: 148,874.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,128.40 : 179,933.40 = 99,392.40 : x
  2. Step 2: Convert to fraction form
    120,128.40/179,933.40 = 99,392.40/x
  3. Step 3: Cross multiply
    120,128.40x = 179,933.40 × 99,392.40
  4. Step 4: Simplify right side
    120,128.40x = 17,884,012,466.16
  5. Step 5: Solve for x
    x = 17,884,012,466.16/120,128.40
  6. Step 6: Final answer
    x = 148,874.14

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.