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Finding the Fourth Proportional to 86,643.49, 129,980.01 and 38,629.51

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Solution

The fourth proportional to 86,643.49, 129,980.01 and 38,629.51 is: 57,950.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,643.49 : 129,980.01 = 38,629.51 : x
  2. Step 2: Convert to fraction form
    86,643.49/129,980.01 = 38,629.51/x
  3. Step 3: Cross multiply
    86,643.49x = 129,980.01 × 38,629.51
  4. Step 4: Simplify right side
    86,643.49x = 5,021,064,227.90
  5. Step 5: Solve for x
    x = 5,021,064,227.90/86,643.49
  6. Step 6: Final answer
    x = 57,950.86

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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.