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Finding the Fourth Proportional to 85,920.72, 128,917.80 and 46,505.76

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Solution

The fourth proportional to 85,920.72, 128,917.80 and 46,505.76 is: 69,778.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,920.72 : 128,917.80 = 46,505.76 : x
  2. Step 2: Convert to fraction form
    85,920.72/128,917.80 = 46,505.76/x
  3. Step 3: Cross multiply
    85,920.72x = 128,917.80 × 46,505.76
  4. Step 4: Simplify right side
    85,920.72x = 5,995,420,266.53
  5. Step 5: Solve for x
    x = 5,995,420,266.53/85,920.72
  6. Step 6: Final answer
    x = 69,778.52

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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.