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Finding the Fourth Proportional to 289,693.60, 434,540.40 and 90,012.40

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Solution

The fourth proportional to 289,693.60, 434,540.40 and 90,012.40 is: 135,018.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,693.60 : 434,540.40 = 90,012.40 : x
  2. Step 2: Convert to fraction form
    289,693.60/434,540.40 = 90,012.40/x
  3. Step 3: Cross multiply
    289,693.60x = 434,540.40 × 90,012.40
  4. Step 4: Simplify right side
    289,693.60x = 39,114,024,300.96
  5. Step 5: Solve for x
    x = 39,114,024,300.96/289,693.60
  6. Step 6: Final answer
    x = 135,018.60

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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.