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Finding the Fourth Proportional to 90,003.40, 134,745.90 and 87,411.40

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Solution

The fourth proportional to 90,003.40, 134,745.90 and 87,411.40 is: 130,865.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,003.40 : 134,745.90 = 87,411.40 : x
  2. Step 2: Convert to fraction form
    90,003.40/134,745.90 = 87,411.40/x
  3. Step 3: Cross multiply
    90,003.40x = 134,745.90 × 87,411.40
  4. Step 4: Simplify right side
    90,003.40x = 11,778,327,763.26
  5. Step 5: Solve for x
    x = 11,778,327,763.26/90,003.40
  6. Step 6: Final answer
    x = 130,865.36

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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.