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Finding the Fourth Proportional to 85,887.84, 128,700.38 and 45,912.51

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Solution

The fourth proportional to 85,887.84, 128,700.38 and 45,912.51 is: 68,798.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,887.84 : 128,700.38 = 45,912.51 : x
  2. Step 2: Convert to fraction form
    85,887.84/128,700.38 = 45,912.51/x
  3. Step 3: Cross multiply
    85,887.84x = 128,700.38 × 45,912.51
  4. Step 4: Simplify right side
    85,887.84x = 5,908,957,483.75
  5. Step 5: Solve for x
    x = 5,908,957,483.75/85,887.84
  6. Step 6: Final answer
    x = 68,798.53

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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.