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Finding the Fourth Proportional to 100,985.88, 139,309.30 and 77,071.03

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Solution

The fourth proportional to 100,985.88, 139,309.30 and 77,071.03 is: 106,318.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,985.88 : 139,309.30 = 77,071.03 : x
  2. Step 2: Convert to fraction form
    100,985.88/139,309.30 = 77,071.03/x
  3. Step 3: Cross multiply
    100,985.88x = 139,309.30 × 77,071.03
  4. Step 4: Simplify right side
    100,985.88x = 10,736,711,617.48
  5. Step 5: Solve for x
    x = 10,736,711,617.48/100,985.88
  6. Step 6: Final answer
    x = 106,318.94

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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.