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Finding the Fourth Proportional to 155,709.96, 214,880.49 and 87,728.01

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Solution

The fourth proportional to 155,709.96, 214,880.49 and 87,728.01 is: 121,065.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,709.96 : 214,880.49 = 87,728.01 : x
  2. Step 2: Convert to fraction form
    155,709.96/214,880.49 = 87,728.01/x
  3. Step 3: Cross multiply
    155,709.96x = 214,880.49 × 87,728.01
  4. Step 4: Simplify right side
    155,709.96x = 18,851,037,775.52
  5. Step 5: Solve for x
    x = 18,851,037,775.52/155,709.96
  6. Step 6: Final answer
    x = 121,065.07

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.