Home / 677,921.78-935,970.30-420,072.35

Finding the Fourth Proportional to 677,921.78, 935,970.30 and 420,072.35

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Solution

The fourth proportional to 677,921.78, 935,970.30 and 420,072.35 is: 579,971.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    677,921.78 : 935,970.30 = 420,072.35 : x
  2. Step 2: Convert to fraction form
    677,921.78/935,970.30 = 420,072.35/x
  3. Step 3: Cross multiply
    677,921.78x = 935,970.30 × 420,072.35
  4. Step 4: Simplify right side
    677,921.78x = 393,175,244,036.19
  5. Step 5: Solve for x
    x = 393,175,244,036.19/677,921.78
  6. Step 6: Final answer
    x = 579,971.40

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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.