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Finding the Fourth Proportional to 128,630.44, 177,453.47 and 77,614.72

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Solution

The fourth proportional to 128,630.44, 177,453.47 and 77,614.72 is: 107,074.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,630.44 : 177,453.47 = 77,614.72 : x
  2. Step 2: Convert to fraction form
    128,630.44/177,453.47 = 77,614.72/x
  3. Step 3: Cross multiply
    128,630.44x = 177,453.47 × 77,614.72
  4. Step 4: Simplify right side
    128,630.44x = 13,773,000,111.74
  5. Step 5: Solve for x
    x = 13,773,000,111.74/128,630.44
  6. Step 6: Final answer
    x = 107,074.19

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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.