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Finding the Fourth Proportional to 65,963.36, 90,979.08 and 56,780.48

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Solution

The fourth proportional to 65,963.36, 90,979.08 and 56,780.48 is: 78,313.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    65,963.36 : 90,979.08 = 56,780.48 : x
  2. Step 2: Convert to fraction form
    65,963.36/90,979.08 = 56,780.48/x
  3. Step 3: Cross multiply
    65,963.36x = 90,979.08 × 56,780.48
  4. Step 4: Simplify right side
    65,963.36x = 5,165,835,832.36
  5. Step 5: Solve for x
    x = 5,165,835,832.36/65,963.36
  6. Step 6: Final answer
    x = 78,313.72

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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.