Home / 12,989.70-17,925.80-7,021.35

Finding the Fourth Proportional to 12,989.70, 17,925.80 and 7,021.35

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Solution

The fourth proportional to 12,989.70, 17,925.80 and 7,021.35 is: 9,689.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,989.70 : 17,925.80 = 7,021.35 : x
  2. Step 2: Convert to fraction form
    12,989.70/17,925.80 = 7,021.35/x
  3. Step 3: Cross multiply
    12,989.70x = 17,925.80 × 7,021.35
  4. Step 4: Simplify right side
    12,989.70x = 125,863,280.72
  5. Step 5: Solve for x
    x = 125,863,280.72/12,989.70
  6. Step 6: Final answer
    x = 9,689.47

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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.