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Finding the Fourth Proportional to 128,920.61, 193,438.94 and 69,686.93

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Solution

The fourth proportional to 128,920.61, 193,438.94 and 69,686.93 is: 104,561.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,920.61 : 193,438.94 = 69,686.93 : x
  2. Step 2: Convert to fraction form
    128,920.61/193,438.94 = 69,686.93/x
  3. Step 3: Cross multiply
    128,920.61x = 193,438.94 × 69,686.93
  4. Step 4: Simplify right side
    128,920.61x = 13,480,166,006.22
  5. Step 5: Solve for x
    x = 13,480,166,006.22/128,920.61
  6. Step 6: Final answer
    x = 104,561.76

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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.