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Finding the Fourth Proportional to 20,673.30, 31,009.95 and 19,215.30

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Solution

The fourth proportional to 20,673.30, 31,009.95 and 19,215.30 is: 28,822.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,673.30 : 31,009.95 = 19,215.30 : x
  2. Step 2: Convert to fraction form
    20,673.30/31,009.95 = 19,215.30/x
  3. Step 3: Cross multiply
    20,673.30x = 31,009.95 × 19,215.30
  4. Step 4: Simplify right side
    20,673.30x = 595,865,492.24
  5. Step 5: Solve for x
    x = 595,865,492.24/20,673.30
  6. Step 6: Final answer
    x = 28,822.95

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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.