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Finding the Fourth Proportional to 128,614.78, 177,429.30 and 83,307.88

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Solution

The fourth proportional to 128,614.78, 177,429.30 and 83,307.88 is: 114,926.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,614.78 : 177,429.30 = 83,307.88 : x
  2. Step 2: Convert to fraction form
    128,614.78/177,429.30 = 83,307.88/x
  3. Step 3: Cross multiply
    128,614.78x = 177,429.30 × 83,307.88
  4. Step 4: Simplify right side
    128,614.78x = 14,781,258,832.88
  5. Step 5: Solve for x
    x = 14,781,258,832.88/128,614.78
  6. Step 6: Final answer
    x = 114,926.60

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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.