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Finding the Fourth Proportional to 89,781.40, 134,558.70 and 45,420.40

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Solution

The fourth proportional to 89,781.40, 134,558.70 and 45,420.40 is: 68,073.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,781.40 : 134,558.70 = 45,420.40 : x
  2. Step 2: Convert to fraction form
    89,781.40/134,558.70 = 45,420.40/x
  3. Step 3: Cross multiply
    89,781.40x = 134,558.70 × 45,420.40
  4. Step 4: Simplify right side
    89,781.40x = 6,111,709,977.48
  5. Step 5: Solve for x
    x = 6,111,709,977.48/89,781.40
  6. Step 6: Final answer
    x = 68,073.23

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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.