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Finding the Fourth Proportional to 100,900.69, 139,215.24 and 70,239.42

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Solution

The fourth proportional to 100,900.69, 139,215.24 and 70,239.42 is: 96,911.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,900.69 : 139,215.24 = 70,239.42 : x
  2. Step 2: Convert to fraction form
    100,900.69/139,215.24 = 70,239.42/x
  3. Step 3: Cross multiply
    100,900.69x = 139,215.24 × 70,239.42
  4. Step 4: Simplify right side
    100,900.69x = 9,778,397,712.76
  5. Step 5: Solve for x
    x = 9,778,397,712.76/100,900.69
  6. Step 6: Final answer
    x = 96,911.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.