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Finding the Fourth Proportional to 216,458.40, 324,719.86 and 66,686.16

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Solution

The fourth proportional to 216,458.40, 324,719.86 and 66,686.16 is: 100,039.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,458.40 : 324,719.86 = 66,686.16 : x
  2. Step 2: Convert to fraction form
    216,458.40/324,719.86 = 66,686.16/x
  3. Step 3: Cross multiply
    216,458.40x = 324,719.86 × 66,686.16
  4. Step 4: Simplify right side
    216,458.40x = 21,654,320,539.14
  5. Step 5: Solve for x
    x = 21,654,320,539.14/216,458.40
  6. Step 6: Final answer
    x = 100,039.18

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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.