Home / 285,539.20-428,308.80-85,890.40

Finding the Fourth Proportional to 285,539.20, 428,308.80 and 85,890.40

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Solution

The fourth proportional to 285,539.20, 428,308.80 and 85,890.40 is: 128,835.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,539.20 : 428,308.80 = 85,890.40 : x
  2. Step 2: Convert to fraction form
    285,539.20/428,308.80 = 85,890.40/x
  3. Step 3: Cross multiply
    285,539.20x = 428,308.80 × 85,890.40
  4. Step 4: Simplify right side
    285,539.20x = 36,787,614,155.52
  5. Step 5: Solve for x
    x = 36,787,614,155.52/285,539.20
  6. Step 6: Final answer
    x = 128,835.60

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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.