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Finding the Fourth Proportional to 81,771.72, 112,526.12 and 72,362.76

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Solution

The fourth proportional to 81,771.72, 112,526.12 and 72,362.76 is: 99,578.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,771.72 : 112,526.12 = 72,362.76 : x
  2. Step 2: Convert to fraction form
    81,771.72/112,526.12 = 72,362.76/x
  3. Step 3: Cross multiply
    81,771.72x = 112,526.12 × 72,362.76
  4. Step 4: Simplify right side
    81,771.72x = 8,142,700,615.29
  5. Step 5: Solve for x
    x = 8,142,700,615.29/81,771.72
  6. Step 6: Final answer
    x = 99,578.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.