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Finding the Fourth Proportional to 85,947.48, 128,796.60 and 61,036.32

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Solution

The fourth proportional to 85,947.48, 128,796.60 and 61,036.32 is: 91,465.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,947.48 : 128,796.60 = 61,036.32 : x
  2. Step 2: Convert to fraction form
    85,947.48/128,796.60 = 61,036.32/x
  3. Step 3: Cross multiply
    85,947.48x = 128,796.60 × 61,036.32
  4. Step 4: Simplify right side
    85,947.48x = 7,861,270,492.51
  5. Step 5: Solve for x
    x = 7,861,270,492.51/85,947.48
  6. Step 6: Final answer
    x = 91,465.98

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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.