Home / 30,928.64-42,655.20-21,519.68

Finding the Fourth Proportional to 30,928.64, 42,655.20 and 21,519.68

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Solution

The fourth proportional to 30,928.64, 42,655.20 and 21,519.68 is: 29,678.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,928.64 : 42,655.20 = 21,519.68 : x
  2. Step 2: Convert to fraction form
    30,928.64/42,655.20 = 21,519.68/x
  3. Step 3: Cross multiply
    30,928.64x = 42,655.20 × 21,519.68
  4. Step 4: Simplify right side
    30,928.64x = 917,926,254.34
  5. Step 5: Solve for x
    x = 917,926,254.34/30,928.64
  6. Step 6: Final answer
    x = 29,678.84

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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.