Home / 427,931.55-641,896.72-128,411.64

Finding the Fourth Proportional to 427,931.55, 641,896.72 and 128,411.64

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Solution

The fourth proportional to 427,931.55, 641,896.72 and 128,411.64 is: 192,617.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,931.55 : 641,896.72 = 128,411.64 : x
  2. Step 2: Convert to fraction form
    427,931.55/641,896.72 = 128,411.64/x
  3. Step 3: Cross multiply
    427,931.55x = 641,896.72 × 128,411.64
  4. Step 4: Simplify right side
    427,931.55x = 82,427,010,204.79
  5. Step 5: Solve for x
    x = 82,427,010,204.79/427,931.55
  6. Step 6: Final answer
    x = 192,617.28

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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.