Home / 30,881.07-42,630.57-20,689.65

Finding the Fourth Proportional to 30,881.07, 42,630.57 and 20,689.65

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Solution

The fourth proportional to 30,881.07, 42,630.57 and 20,689.65 is: 28,561.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,881.07 : 42,630.57 = 20,689.65 : x
  2. Step 2: Convert to fraction form
    30,881.07/42,630.57 = 20,689.65/x
  3. Step 3: Cross multiply
    30,881.07x = 42,630.57 × 20,689.65
  4. Step 4: Simplify right side
    30,881.07x = 882,011,572.60
  5. Step 5: Solve for x
    x = 882,011,572.60/30,881.07
  6. Step 6: Final answer
    x = 28,561.56

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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.