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Finding the Fourth Proportional to 72,420.40, 108,630.60 and 47,537.20

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Solution

The fourth proportional to 72,420.40, 108,630.60 and 47,537.20 is: 71,305.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,420.40 : 108,630.60 = 47,537.20 : x
  2. Step 2: Convert to fraction form
    72,420.40/108,630.60 = 47,537.20/x
  3. Step 3: Cross multiply
    72,420.40x = 108,630.60 × 47,537.20
  4. Step 4: Simplify right side
    72,420.40x = 5,163,994,558.32
  5. Step 5: Solve for x
    x = 5,163,994,558.32/72,420.40
  6. Step 6: Final answer
    x = 71,305.80

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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.