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Finding the Fourth Proportional to 128,099.64, 176,726.70 and 85,590.84

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Solution

The fourth proportional to 128,099.64, 176,726.70 and 85,590.84 is: 118,081.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,099.64 : 176,726.70 = 85,590.84 : x
  2. Step 2: Convert to fraction form
    128,099.64/176,726.70 = 85,590.84/x
  3. Step 3: Cross multiply
    128,099.64x = 176,726.70 × 85,590.84
  4. Step 4: Simplify right side
    128,099.64x = 15,126,186,703.43
  5. Step 5: Solve for x
    x = 15,126,186,703.43/128,099.64
  6. Step 6: Final answer
    x = 118,081.41

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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.