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Finding the Fourth Proportional to 30,417.60, 45,723.60 and 21,712.80

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Solution

The fourth proportional to 30,417.60, 45,723.60 and 21,712.80 is: 32,638.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,417.60 : 45,723.60 = 21,712.80 : x
  2. Step 2: Convert to fraction form
    30,417.60/45,723.60 = 21,712.80/x
  3. Step 3: Cross multiply
    30,417.60x = 45,723.60 × 21,712.80
  4. Step 4: Simplify right side
    30,417.60x = 992,787,382.08
  5. Step 5: Solve for x
    x = 992,787,382.08/30,417.60
  6. Step 6: Final answer
    x = 32,638.58

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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.