Home / 427,945.01-642,024.09-128,431.17

Finding the Fourth Proportional to 427,945.01, 642,024.09 and 128,431.17

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Solution

The fourth proportional to 427,945.01, 642,024.09 and 128,431.17 is: 192,678.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,945.01 : 642,024.09 = 128,431.17 : x
  2. Step 2: Convert to fraction form
    427,945.01/642,024.09 = 128,431.17/x
  3. Step 3: Cross multiply
    427,945.01x = 642,024.09 × 128,431.17
  4. Step 4: Simplify right side
    427,945.01x = 82,455,905,046.89
  5. Step 5: Solve for x
    x = 82,455,905,046.89/427,945.01
  6. Step 6: Final answer
    x = 192,678.74

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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.