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Finding the Fourth Proportional to 285,300.61, 428,021.99 and 85,624.67

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Solution

The fourth proportional to 285,300.61, 428,021.99 and 85,624.67 is: 128,458.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,300.61 : 428,021.99 = 85,624.67 : x
  2. Step 2: Convert to fraction form
    285,300.61/428,021.99 = 85,624.67/x
  3. Step 3: Cross multiply
    285,300.61x = 428,021.99 × 85,624.67
  4. Step 4: Simplify right side
    285,300.61x = 36,649,241,646.49
  5. Step 5: Solve for x
    x = 36,649,241,646.49/285,300.61
  6. Step 6: Final answer
    x = 128,458.34

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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.