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Finding the Fourth Proportional to 52,670.40, 78,890.40 and 40,891.20

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Solution

The fourth proportional to 52,670.40, 78,890.40 and 40,891.20 is: 61,247.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,670.40 : 78,890.40 = 40,891.20 : x
  2. Step 2: Convert to fraction form
    52,670.40/78,890.40 = 40,891.20/x
  3. Step 3: Cross multiply
    52,670.40x = 78,890.40 × 40,891.20
  4. Step 4: Simplify right side
    52,670.40x = 3,225,923,124.48
  5. Step 5: Solve for x
    x = 3,225,923,124.48/52,670.40
  6. Step 6: Final answer
    x = 61,247.36

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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.