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Finding the Fourth Proportional to 128,712.55, 177,601.52 and 85,756.11

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Solution

The fourth proportional to 128,712.55, 177,601.52 and 85,756.11 is: 118,328.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,712.55 : 177,601.52 = 85,756.11 : x
  2. Step 2: Convert to fraction form
    128,712.55/177,601.52 = 85,756.11/x
  3. Step 3: Cross multiply
    128,712.55x = 177,601.52 × 85,756.11
  4. Step 4: Simplify right side
    128,712.55x = 15,230,415,485.29
  5. Step 5: Solve for x
    x = 15,230,415,485.29/128,712.55
  6. Step 6: Final answer
    x = 118,328.91

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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.