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Finding the Fourth Proportional to 128,572.55, 192,931.74 and 69,406.91

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Solution

The fourth proportional to 128,572.55, 192,931.74 and 69,406.91 is: 104,149.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,572.55 : 192,931.74 = 69,406.91 : x
  2. Step 2: Convert to fraction form
    128,572.55/192,931.74 = 69,406.91/x
  3. Step 3: Cross multiply
    128,572.55x = 192,931.74 × 69,406.91
  4. Step 4: Simplify right side
    128,572.55x = 13,390,795,673.16
  5. Step 5: Solve for x
    x = 13,390,795,673.16/128,572.55
  6. Step 6: Final answer
    x = 104,149.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.