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Finding the Fourth Proportional to 78,321.96, 108,005.40 and 69,681.24

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Solution

The fourth proportional to 78,321.96, 108,005.40 and 69,681.24 is: 96,089.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,321.96 : 108,005.40 = 69,681.24 : x
  2. Step 2: Convert to fraction form
    78,321.96/108,005.40 = 69,681.24/x
  3. Step 3: Cross multiply
    78,321.96x = 108,005.40 × 69,681.24
  4. Step 4: Simplify right side
    78,321.96x = 7,525,950,198.70
  5. Step 5: Solve for x
    x = 7,525,950,198.70/78,321.96
  6. Step 6: Final answer
    x = 96,089.91

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1.5x scale

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.