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Finding the Fourth Proportional to 64,986.40, 89,722.92 and 53,078.32

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Solution

The fourth proportional to 64,986.40, 89,722.92 and 53,078.32 is: 73,282.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,986.40 : 89,722.92 = 53,078.32 : x
  2. Step 2: Convert to fraction form
    64,986.40/89,722.92 = 53,078.32/x
  3. Step 3: Cross multiply
    64,986.40x = 89,722.92 × 53,078.32
  4. Step 4: Simplify right side
    64,986.40x = 4,762,341,859.09
  5. Step 5: Solve for x
    x = 4,762,341,859.09/64,986.40
  6. Step 6: Final answer
    x = 73,282.13

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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.