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Finding the Fourth Proportional to 128,249.40, 176,978.64 and 70,885.74

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Solution

The fourth proportional to 128,249.40, 176,978.64 and 70,885.74 is: 97,819.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,249.40 : 176,978.64 = 70,885.74 : x
  2. Step 2: Convert to fraction form
    128,249.40/176,978.64 = 70,885.74/x
  3. Step 3: Cross multiply
    128,249.40x = 176,978.64 × 70,885.74
  4. Step 4: Simplify right side
    128,249.40x = 12,545,261,860.59
  5. Step 5: Solve for x
    x = 12,545,261,860.59/128,249.40
  6. Step 6: Final answer
    x = 97,819.26

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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.