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Finding the Fourth Proportional to 52,190.40, 78,400.80 and 36,638.40

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Solution

The fourth proportional to 52,190.40, 78,400.80 and 36,638.40 is: 55,038.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,190.40 : 78,400.80 = 36,638.40 : x
  2. Step 2: Convert to fraction form
    52,190.40/78,400.80 = 36,638.40/x
  3. Step 3: Cross multiply
    52,190.40x = 78,400.80 × 36,638.40
  4. Step 4: Simplify right side
    52,190.40x = 2,872,479,870.72
  5. Step 5: Solve for x
    x = 2,872,479,870.72/52,190.40
  6. Step 6: Final answer
    x = 55,038.47

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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.