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Finding the Fourth Proportional to 80,688.30, 121,032.45 and 72,912.30

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Solution

The fourth proportional to 80,688.30, 121,032.45 and 72,912.30 is: 109,368.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,688.30 : 121,032.45 = 72,912.30 : x
  2. Step 2: Convert to fraction form
    80,688.30/121,032.45 = 72,912.30/x
  3. Step 3: Cross multiply
    80,688.30x = 121,032.45 × 72,912.30
  4. Step 4: Simplify right side
    80,688.30x = 8,824,754,304.14
  5. Step 5: Solve for x
    x = 8,824,754,304.14/80,688.30
  6. Step 6: Final answer
    x = 109,368.45

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1.5x scale

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.