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Finding the Fourth Proportional to 70,115.40, 105,173.10 and 42,121.80

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Solution

The fourth proportional to 70,115.40, 105,173.10 and 42,121.80 is: 63,182.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,115.40 : 105,173.10 = 42,121.80 : x
  2. Step 2: Convert to fraction form
    70,115.40/105,173.10 = 42,121.80/x
  3. Step 3: Cross multiply
    70,115.40x = 105,173.10 × 42,121.80
  4. Step 4: Simplify right side
    70,115.40x = 4,430,080,283.58
  5. Step 5: Solve for x
    x = 4,430,080,283.58/70,115.40
  6. Step 6: Final answer
    x = 63,182.70

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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.