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Finding the Fourth Proportional to 92,596.55, 138,730.80 and 78,490.40

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Solution

The fourth proportional to 92,596.55, 138,730.80 and 78,490.40 is: 117,596.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,596.55 : 138,730.80 = 78,490.40 : x
  2. Step 2: Convert to fraction form
    92,596.55/138,730.80 = 78,490.40/x
  3. Step 3: Cross multiply
    92,596.55x = 138,730.80 × 78,490.40
  4. Step 4: Simplify right side
    92,596.55x = 10,889,035,984.32
  5. Step 5: Solve for x
    x = 10,889,035,984.32/92,596.55
  6. Step 6: Final answer
    x = 117,596.56

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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.