Home / 20,931.12-31,355.16-12,613.32

Finding the Fourth Proportional to 20,931.12, 31,355.16 and 12,613.32

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Solution

The fourth proportional to 20,931.12, 31,355.16 and 12,613.32 is: 18,894.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.12 : 31,355.16 = 12,613.32 : x
  2. Step 2: Convert to fraction form
    20,931.12/31,355.16 = 12,613.32/x
  3. Step 3: Cross multiply
    20,931.12x = 31,355.16 × 12,613.32
  4. Step 4: Simplify right side
    20,931.12x = 395,492,666.73
  5. Step 5: Solve for x
    x = 395,492,666.73/20,931.12
  6. Step 6: Final answer
    x = 18,894.96

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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.