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Finding the Fourth Proportional to 72,969.20, 109,210.80 and 52,921.70

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Solution

The fourth proportional to 72,969.20, 109,210.80 and 52,921.70 is: 79,206.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,969.20 : 109,210.80 = 52,921.70 : x
  2. Step 2: Convert to fraction form
    72,969.20/109,210.80 = 52,921.70/x
  3. Step 3: Cross multiply
    72,969.20x = 109,210.80 × 52,921.70
  4. Step 4: Simplify right side
    72,969.20x = 5,779,621,194.36
  5. Step 5: Solve for x
    x = 5,779,621,194.36/72,969.20
  6. Step 6: Final answer
    x = 79,206.31

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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.