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Finding the Fourth Proportional to 70,012.20, 105,018.08 and 17,421.72

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Solution

The fourth proportional to 70,012.20, 105,018.08 and 17,421.72 is: 26,132.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,012.20 : 105,018.08 = 17,421.72 : x
  2. Step 2: Convert to fraction form
    70,012.20/105,018.08 = 17,421.72/x
  3. Step 3: Cross multiply
    70,012.20x = 105,018.08 × 17,421.72
  4. Step 4: Simplify right side
    70,012.20x = 1,829,595,584.70
  5. Step 5: Solve for x
    x = 1,829,595,584.70/70,012.20
  6. Step 6: Final answer
    x = 26,132.53

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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.