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Finding the Fourth Proportional to 70,611.20, 105,916.80 and 35,619.20

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Solution

The fourth proportional to 70,611.20, 105,916.80 and 35,619.20 is: 53,428.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,611.20 : 105,916.80 = 35,619.20 : x
  2. Step 2: Convert to fraction form
    70,611.20/105,916.80 = 35,619.20/x
  3. Step 3: Cross multiply
    70,611.20x = 105,916.80 × 35,619.20
  4. Step 4: Simplify right side
    70,611.20x = 3,772,671,682.56
  5. Step 5: Solve for x
    x = 3,772,671,682.56/70,611.20
  6. Step 6: Final answer
    x = 53,428.80

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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.