Home / 427,987.40-641,979.58-128,466.68

Finding the Fourth Proportional to 427,987.40, 641,979.58 and 128,466.68

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Solution

The fourth proportional to 427,987.40, 641,979.58 and 128,466.68 is: 192,699.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,987.40 : 641,979.58 = 128,466.68 : x
  2. Step 2: Convert to fraction form
    427,987.40/641,979.58 = 128,466.68/x
  3. Step 3: Cross multiply
    427,987.40x = 641,979.58 × 128,466.68
  4. Step 4: Simplify right side
    427,987.40x = 82,472,985,270.39
  5. Step 5: Solve for x
    x = 82,472,985,270.39/427,987.40
  6. Step 6: Final answer
    x = 192,699.56

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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.