Home / 30,876.55-42,624.34-20,685.13

Finding the Fourth Proportional to 30,876.55, 42,624.34 and 20,685.13

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Solution

The fourth proportional to 30,876.55, 42,624.34 and 20,685.13 is: 28,555.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,876.55 : 42,624.34 = 20,685.13 : x
  2. Step 2: Convert to fraction form
    30,876.55/42,624.34 = 20,685.13/x
  3. Step 3: Cross multiply
    30,876.55x = 42,624.34 × 20,685.13
  4. Step 4: Simplify right side
    30,876.55x = 881,689,855.79
  5. Step 5: Solve for x
    x = 881,689,855.79/30,876.55
  6. Step 6: Final answer
    x = 28,555.33

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Double scale
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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.