Home / 428,935.07-643,406.93-129,418.13

Finding the Fourth Proportional to 428,935.07, 643,406.93 and 129,418.13

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Solution

The fourth proportional to 428,935.07, 643,406.93 and 129,418.13 is: 194,128.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,935.07 : 643,406.93 = 129,418.13 : x
  2. Step 2: Convert to fraction form
    428,935.07/643,406.93 = 129,418.13/x
  3. Step 3: Cross multiply
    428,935.07x = 643,406.93 × 129,418.13
  4. Step 4: Simplify right side
    428,935.07x = 83,268,521,709.64
  5. Step 5: Solve for x
    x = 83,268,521,709.64/428,935.07
  6. Step 6: Final answer
    x = 194,128.50

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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.