Home / 20,688.10-31,032.15-12,393.70

Finding the Fourth Proportional to 20,688.10, 31,032.15 and 12,393.70

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Solution

The fourth proportional to 20,688.10, 31,032.15 and 12,393.70 is: 18,590.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.10 : 31,032.15 = 12,393.70 : x
  2. Step 2: Convert to fraction form
    20,688.10/31,032.15 = 12,393.70/x
  3. Step 3: Cross multiply
    20,688.10x = 31,032.15 × 12,393.70
  4. Step 4: Simplify right side
    20,688.10x = 384,603,157.46
  5. Step 5: Solve for x
    x = 384,603,157.46/20,688.10
  6. Step 6: Final answer
    x = 18,590.55

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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.