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Finding the Fourth Proportional to 128,039.78, 176,693.86 and 70,679.02

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Solution

The fourth proportional to 128,039.78, 176,693.86 and 70,679.02 is: 97,536.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,039.78 : 176,693.86 = 70,679.02 : x
  2. Step 2: Convert to fraction form
    128,039.78/176,693.86 = 70,679.02/x
  3. Step 3: Cross multiply
    128,039.78x = 176,693.86 × 70,679.02
  4. Step 4: Simplify right side
    128,039.78x = 12,488,548,420.33
  5. Step 5: Solve for x
    x = 12,488,548,420.33/128,039.78
  6. Step 6: Final answer
    x = 97,536.47

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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.