Home / 20,910.60-31,365.50-8,430.34

Finding the Fourth Proportional to 20,910.60, 31,365.50 and 8,430.34

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Solution

The fourth proportional to 20,910.60, 31,365.50 and 8,430.34 is: 12,645.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.60 : 31,365.50 = 8,430.34 : x
  2. Step 2: Convert to fraction form
    20,910.60/31,365.50 = 8,430.34/x
  3. Step 3: Cross multiply
    20,910.60x = 31,365.50 × 8,430.34
  4. Step 4: Simplify right side
    20,910.60x = 264,421,829.27
  5. Step 5: Solve for x
    x = 264,421,829.27/20,910.60
  6. Step 6: Final answer
    x = 12,645.35

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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.