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Finding the Fourth Proportional to 86,860.80, 130,291.12 and 21,196.80

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Solution

The fourth proportional to 86,860.80, 130,291.12 and 21,196.80 is: 31,795.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,860.80 : 130,291.12 = 21,196.80 : x
  2. Step 2: Convert to fraction form
    86,860.80/130,291.12 = 21,196.80/x
  3. Step 3: Cross multiply
    86,860.80x = 130,291.12 × 21,196.80
  4. Step 4: Simplify right side
    86,860.80x = 2,761,754,812.42
  5. Step 5: Solve for x
    x = 2,761,754,812.42/86,860.80
  6. Step 6: Final answer
    x = 31,795.18

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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.