Home / 21,188.80-31,856.40-19,818.40

Finding the Fourth Proportional to 21,188.80, 31,856.40 and 19,818.40

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Solution

The fourth proportional to 21,188.80, 31,856.40 and 19,818.40 is: 29,796.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,188.80 : 31,856.40 = 19,818.40 : x
  2. Step 2: Convert to fraction form
    21,188.80/31,856.40 = 19,818.40/x
  3. Step 3: Cross multiply
    21,188.80x = 31,856.40 × 19,818.40
  4. Step 4: Simplify right side
    21,188.80x = 631,342,877.76
  5. Step 5: Solve for x
    x = 631,342,877.76/21,188.80
  6. Step 6: Final answer
    x = 29,796.07

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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.