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Finding the Fourth Proportional to 90,705.70, 136,058.55 and 80,683.30

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Solution

The fourth proportional to 90,705.70, 136,058.55 and 80,683.30 is: 121,024.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,705.70 : 136,058.55 = 80,683.30 : x
  2. Step 2: Convert to fraction form
    90,705.70/136,058.55 = 80,683.30/x
  3. Step 3: Cross multiply
    90,705.70x = 136,058.55 × 80,683.30
  4. Step 4: Simplify right side
    90,705.70x = 10,977,652,807.22
  5. Step 5: Solve for x
    x = 10,977,652,807.22/90,705.70
  6. Step 6: Final answer
    x = 121,024.95

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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.