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Finding the Fourth Proportional to 285,503.70, 428,255.55 and 85,854.90

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Solution

The fourth proportional to 285,503.70, 428,255.55 and 85,854.90 is: 128,782.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,503.70 : 428,255.55 = 85,854.90 : x
  2. Step 2: Convert to fraction form
    285,503.70/428,255.55 = 85,854.90/x
  3. Step 3: Cross multiply
    285,503.70x = 428,255.55 × 85,854.90
  4. Step 4: Simplify right side
    285,503.70x = 36,767,837,419.70
  5. Step 5: Solve for x
    x = 36,767,837,419.70/285,503.70
  6. Step 6: Final answer
    x = 128,782.35

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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.