Home / 128,622.38-177,401.30-112,679.16

Finding the Fourth Proportional to 128,622.38, 177,401.30 and 112,679.16

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Solution

The fourth proportional to 128,622.38, 177,401.30 and 112,679.16 is: 155,411.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,622.38 : 177,401.30 = 112,679.16 : x
  2. Step 2: Convert to fraction form
    128,622.38/177,401.30 = 112,679.16/x
  3. Step 3: Cross multiply
    128,622.38x = 177,401.30 × 112,679.16
  4. Step 4: Simplify right side
    128,622.38x = 19,989,429,466.91
  5. Step 5: Solve for x
    x = 19,989,429,466.91/128,622.38
  6. Step 6: Final answer
    x = 155,411.75

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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.