Home / 21,123.20-31,684.80-19,438.40

Finding the Fourth Proportional to 21,123.20, 31,684.80 and 19,438.40

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Solution

The fourth proportional to 21,123.20, 31,684.80 and 19,438.40 is: 29,157.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,123.20 : 31,684.80 = 19,438.40 : x
  2. Step 2: Convert to fraction form
    21,123.20/31,684.80 = 19,438.40/x
  3. Step 3: Cross multiply
    21,123.20x = 31,684.80 × 19,438.40
  4. Step 4: Simplify right side
    21,123.20x = 615,901,816.32
  5. Step 5: Solve for x
    x = 615,901,816.32/21,123.20
  6. Step 6: Final answer
    x = 29,157.60

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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.