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Finding the Fourth Proportional to 91,980.96, 137,856.08 and 39,328.64

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Solution

The fourth proportional to 91,980.96, 137,856.08 and 39,328.64 is: 58,943.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,980.96 : 137,856.08 = 39,328.64 : x
  2. Step 2: Convert to fraction form
    91,980.96/137,856.08 = 39,328.64/x
  3. Step 3: Cross multiply
    91,980.96x = 137,856.08 × 39,328.64
  4. Step 4: Simplify right side
    91,980.96x = 5,421,692,142.13
  5. Step 5: Solve for x
    x = 5,421,692,142.13/91,980.96
  6. Step 6: Final answer
    x = 58,943.64

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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.