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Finding the Fourth Proportional to 89,720.60, 134,580.90 and 68,725.40

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Solution

The fourth proportional to 89,720.60, 134,580.90 and 68,725.40 is: 103,088.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,720.60 : 134,580.90 = 68,725.40 : x
  2. Step 2: Convert to fraction form
    89,720.60/134,580.90 = 68,725.40/x
  3. Step 3: Cross multiply
    89,720.60x = 134,580.90 × 68,725.40
  4. Step 4: Simplify right side
    89,720.60x = 9,249,126,184.86
  5. Step 5: Solve for x
    x = 9,249,126,184.86/89,720.60
  6. Step 6: Final answer
    x = 103,088.10

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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.