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Finding the Fourth Proportional to 20,417.89, 30,585.51 and 18,716.89

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Solution

The fourth proportional to 20,417.89, 30,585.51 and 18,716.89 is: 28,037.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,417.89 : 30,585.51 = 18,716.89 : x
  2. Step 2: Convert to fraction form
    20,417.89/30,585.51 = 18,716.89/x
  3. Step 3: Cross multiply
    20,417.89x = 30,585.51 × 18,716.89
  4. Step 4: Simplify right side
    20,417.89x = 572,465,626.26
  5. Step 5: Solve for x
    x = 572,465,626.26/20,417.89
  6. Step 6: Final answer
    x = 28,037.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.