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Finding the Fourth Proportional to 158,728.75, 219,038.78 and 87,109.97

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Solution

The fourth proportional to 158,728.75, 219,038.78 and 87,109.97 is: 120,207.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,728.75 : 219,038.78 = 87,109.97 : x
  2. Step 2: Convert to fraction form
    158,728.75/219,038.78 = 87,109.97/x
  3. Step 3: Cross multiply
    158,728.75x = 219,038.78 × 87,109.97
  4. Step 4: Simplify right side
    158,728.75x = 19,080,461,554.64
  5. Step 5: Solve for x
    x = 19,080,461,554.64/158,728.75
  6. Step 6: Final answer
    x = 120,207.97

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1.5x scale

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.