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Finding the Fourth Proportional to 70,607.36, 105,911.05 and 20,687.47

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Solution

The fourth proportional to 70,607.36, 105,911.05 and 20,687.47 is: 31,031.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,607.36 : 105,911.05 = 20,687.47 : x
  2. Step 2: Convert to fraction form
    70,607.36/105,911.05 = 20,687.47/x
  3. Step 3: Cross multiply
    70,607.36x = 105,911.05 × 20,687.47
  4. Step 4: Simplify right side
    70,607.36x = 2,191,031,669.54
  5. Step 5: Solve for x
    x = 2,191,031,669.54/70,607.36
  6. Step 6: Final answer
    x = 31,031.21

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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.