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Finding the Fourth Proportional to 91,085.60, 135,712.59 and 85,992.63

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Solution

The fourth proportional to 91,085.60, 135,712.59 and 85,992.63 is: 128,124.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,085.60 : 135,712.59 = 85,992.63 : x
  2. Step 2: Convert to fraction form
    91,085.60/135,712.59 = 85,992.63/x
  3. Step 3: Cross multiply
    91,085.60x = 135,712.59 × 85,992.63
  4. Step 4: Simplify right side
    91,085.60x = 11,670,282,538.21
  5. Step 5: Solve for x
    x = 11,670,282,538.21/91,085.60
  6. Step 6: Final answer
    x = 128,124.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.