Home / 31,564.40-47,284.20-20,478.80

Finding the Fourth Proportional to 31,564.40, 47,284.20 and 20,478.80

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Solution

The fourth proportional to 31,564.40, 47,284.20 and 20,478.80 is: 30,677.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,564.40 : 47,284.20 = 20,478.80 : x
  2. Step 2: Convert to fraction form
    31,564.40/47,284.20 = 20,478.80/x
  3. Step 3: Cross multiply
    31,564.40x = 47,284.20 × 20,478.80
  4. Step 4: Simplify right side
    31,564.40x = 968,323,674.96
  5. Step 5: Solve for x
    x = 968,323,674.96/31,564.40
  6. Step 6: Final answer
    x = 30,677.72

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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.