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Finding the Fourth Proportional to 86,138.90, 118,862.16 and 51,681.80

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Solution

The fourth proportional to 86,138.90, 118,862.16 and 51,681.80 is: 71,315.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,138.90 : 118,862.16 = 51,681.80 : x
  2. Step 2: Convert to fraction form
    86,138.90/118,862.16 = 51,681.80/x
  3. Step 3: Cross multiply
    86,138.90x = 118,862.16 × 51,681.80
  4. Step 4: Simplify right side
    86,138.90x = 6,143,010,380.69
  5. Step 5: Solve for x
    x = 6,143,010,380.69/86,138.90
  6. Step 6: Final answer
    x = 71,315.17

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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.