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Finding the Fourth Proportional to 100,678.61, 138,937.00 and 55,359.51

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Solution

The fourth proportional to 100,678.61, 138,937.00 and 55,359.51 is: 76,396.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,678.61 : 138,937.00 = 55,359.51 : x
  2. Step 2: Convert to fraction form
    100,678.61/138,937.00 = 55,359.51/x
  3. Step 3: Cross multiply
    100,678.61x = 138,937.00 × 55,359.51
  4. Step 4: Simplify right side
    100,678.61x = 7,691,484,506.46
  5. Step 5: Solve for x
    x = 7,691,484,506.46/100,678.61
  6. Step 6: Final answer
    x = 76,396.41

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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.