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Finding the Fourth Proportional to 70,603.76, 105,920.22 and 20,685.48

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Solution

The fourth proportional to 70,603.76, 105,920.22 and 20,685.48 is: 31,032.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,603.76 : 105,920.22 = 20,685.48 : x
  2. Step 2: Convert to fraction form
    70,603.76/105,920.22 = 20,685.48/x
  3. Step 3: Cross multiply
    70,603.76x = 105,920.22 × 20,685.48
  4. Step 4: Simplify right side
    70,603.76x = 2,191,010,592.41
  5. Step 5: Solve for x
    x = 2,191,010,592.41/70,603.76
  6. Step 6: Final answer
    x = 31,032.49

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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.