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Finding the Fourth Proportional to 115,911.40, 173,641.51 and 85,461.07

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Solution

The fourth proportional to 115,911.40, 173,641.51 and 85,461.07 is: 128,025.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,911.40 : 173,641.51 = 85,461.07 : x
  2. Step 2: Convert to fraction form
    115,911.40/173,641.51 = 85,461.07/x
  3. Step 3: Cross multiply
    115,911.40x = 173,641.51 × 85,461.07
  4. Step 4: Simplify right side
    115,911.40x = 14,839,588,813.71
  5. Step 5: Solve for x
    x = 14,839,588,813.71/115,911.40
  6. Step 6: Final answer
    x = 128,025.27

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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.