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Finding the Fourth Proportional to 64,678.32, 96,991.20 and 20,291.40

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Solution

The fourth proportional to 64,678.32, 96,991.20 and 20,291.40 is: 30,428.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,678.32 : 96,991.20 = 20,291.40 : x
  2. Step 2: Convert to fraction form
    64,678.32/96,991.20 = 20,291.40/x
  3. Step 3: Cross multiply
    64,678.32x = 96,991.20 × 20,291.40
  4. Step 4: Simplify right side
    64,678.32x = 1,968,087,235.68
  5. Step 5: Solve for x
    x = 1,968,087,235.68/64,678.32
  6. Step 6: Final answer
    x = 30,428.86

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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.