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Finding the Fourth Proportional to 64,405.28, 88,664.28 and 55,416.32

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Solution

The fourth proportional to 64,405.28, 88,664.28 and 55,416.32 is: 76,289.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,405.28 : 88,664.28 = 55,416.32 : x
  2. Step 2: Convert to fraction form
    64,405.28/88,664.28 = 55,416.32/x
  3. Step 3: Cross multiply
    64,405.28x = 88,664.28 × 55,416.32
  4. Step 4: Simplify right side
    64,405.28x = 4,913,448,113.05
  5. Step 5: Solve for x
    x = 4,913,448,113.05/64,405.28
  6. Step 6: Final answer
    x = 76,289.52

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.