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Finding the Fourth Proportional to 70,239.09, 105,358.75 and 28,686.09

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Solution

The fourth proportional to 70,239.09, 105,358.75 and 28,686.09 is: 43,029.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,239.09 : 105,358.75 = 28,686.09 : x
  2. Step 2: Convert to fraction form
    70,239.09/105,358.75 = 28,686.09/x
  3. Step 3: Cross multiply
    70,239.09x = 105,358.75 × 28,686.09
  4. Step 4: Simplify right side
    70,239.09x = 3,022,330,908.17
  5. Step 5: Solve for x
    x = 3,022,330,908.17/70,239.09
  6. Step 6: Final answer
    x = 43,029.18

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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.