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Finding the Fourth Proportional to 70,648.39, 105,988.99 and 20,726.47

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Solution

The fourth proportional to 70,648.39, 105,988.99 and 20,726.47 is: 31,094.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,648.39 : 105,988.99 = 20,726.47 : x
  2. Step 2: Convert to fraction form
    70,648.39/105,988.99 = 20,726.47/x
  3. Step 3: Cross multiply
    70,648.39x = 105,988.99 × 20,726.47
  4. Step 4: Simplify right side
    70,648.39x = 2,196,777,621.57
  5. Step 5: Solve for x
    x = 2,196,777,621.57/70,648.39
  6. Step 6: Final answer
    x = 31,094.52

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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.