Home / 20,689.58-28,543.93-12,620.45

Finding the Fourth Proportional to 20,689.58, 28,543.93 and 12,620.45

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Solution

The fourth proportional to 20,689.58, 28,543.93 and 12,620.45 is: 17,411.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,689.58 : 28,543.93 = 12,620.45 : x
  2. Step 2: Convert to fraction form
    20,689.58/28,543.93 = 12,620.45/x
  3. Step 3: Cross multiply
    20,689.58x = 28,543.93 × 12,620.45
  4. Step 4: Simplify right side
    20,689.58x = 360,237,281.18
  5. Step 5: Solve for x
    x = 360,237,281.18/20,689.58
  6. Step 6: Final answer
    x = 17,411.53

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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.