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Finding the Fourth Proportional to 12,989.80, 17,925.88 and 7,021.47

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Solution

The fourth proportional to 12,989.80, 17,925.88 and 7,021.47 is: 9,689.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989.80 : 17,925.88 = 7,021.47 : x
  2. Step 2: Convert to fraction form
    12,989.80/17,925.88 = 7,021.47/x
  3. Step 3: Cross multiply
    12,989.80x = 17,925.88 × 7,021.47
  4. Step 4: Simplify right side
    12,989.80x = 125,865,972.58
  5. Step 5: Solve for x
    x = 125,865,972.58/12,989.80
  6. Step 6: Final answer
    x = 9,689.60

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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.