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Finding the Fourth Proportional to 12,989.21, 17,925.23 and 7,020.99

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Solution

The fourth proportional to 12,989.21, 17,925.23 and 7,020.99 is: 9,689.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989.21 : 17,925.23 = 7,020.99 : x
  2. Step 2: Convert to fraction form
    12,989.21/17,925.23 = 7,020.99/x
  3. Step 3: Cross multiply
    12,989.21x = 17,925.23 × 7,020.99
  4. Step 4: Simplify right side
    12,989.21x = 125,852,878.13
  5. Step 5: Solve for x
    x = 125,852,878.13/12,989.21
  6. Step 6: Final answer
    x = 9,689.04

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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.