Home / 287,788.80-431,683.20-285,945.60

Finding the Fourth Proportional to 287,788.80, 431,683.20 and 285,945.60

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Solution

The fourth proportional to 287,788.80, 431,683.20 and 285,945.60 is: 428,918.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,788.80 : 431,683.20 = 285,945.60 : x
  2. Step 2: Convert to fraction form
    287,788.80/431,683.20 = 285,945.60/x
  3. Step 3: Cross multiply
    287,788.80x = 431,683.20 × 285,945.60
  4. Step 4: Simplify right side
    287,788.80x = 123,437,911,633.92
  5. Step 5: Solve for x
    x = 123,437,911,633.92/287,788.80
  6. Step 6: Final answer
    x = 428,918.40

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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.