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Finding the Fourth Proportional to 85,920.35, 128,931.55 and 46,476.59

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Solution

The fourth proportional to 85,920.35, 128,931.55 and 46,476.59 is: 69,742.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.35 : 128,931.55 = 46,476.59 : x
  2. Step 2: Convert to fraction form
    85,920.35/128,931.55 = 46,476.59/x
  3. Step 3: Cross multiply
    85,920.35x = 128,931.55 × 46,476.59
  4. Step 4: Simplify right side
    85,920.35x = 5,992,298,026.57
  5. Step 5: Solve for x
    x = 5,992,298,026.57/85,920.35
  6. Step 6: Final answer
    x = 69,742.48

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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.