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Finding the Fourth Proportional to 21,007.30, 31,510.95 and 12,712.90

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Solution

The fourth proportional to 21,007.30, 31,510.95 and 12,712.90 is: 19,069.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,007.30 : 31,510.95 = 12,712.90 : x
  2. Step 2: Convert to fraction form
    21,007.30/31,510.95 = 12,712.90/x
  3. Step 3: Cross multiply
    21,007.30x = 31,510.95 × 12,712.90
  4. Step 4: Simplify right side
    21,007.30x = 400,595,556.26
  5. Step 5: Solve for x
    x = 400,595,556.26/21,007.30
  6. Step 6: Final answer
    x = 19,069.35

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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.