Home / 677,921.21-935,969.52-420,071.79

Finding the Fourth Proportional to 677,921.21, 935,969.52 and 420,071.79

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Solution

The fourth proportional to 677,921.21, 935,969.52 and 420,071.79 is: 579,970.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,921.21 : 935,969.52 = 420,071.79 : x
  2. Step 2: Convert to fraction form
    677,921.21/935,969.52 = 420,071.79/x
  3. Step 3: Cross multiply
    677,921.21x = 935,969.52 × 420,071.79
  4. Step 4: Simplify right side
    677,921.21x = 393,174,391,472.17
  5. Step 5: Solve for x
    x = 393,174,391,472.17/677,921.21
  6. Step 6: Final answer
    x = 579,970.63

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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.