Home / 20,971.56-31,455.18-6,931.08

Finding the Fourth Proportional to 20,971.56, 31,455.18 and 6,931.08

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Solution

The fourth proportional to 20,971.56, 31,455.18 and 6,931.08 is: 10,395.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.56 : 31,455.18 = 6,931.08 : x
  2. Step 2: Convert to fraction form
    20,971.56/31,455.18 = 6,931.08/x
  3. Step 3: Cross multiply
    20,971.56x = 31,455.18 × 6,931.08
  4. Step 4: Simplify right side
    20,971.56x = 218,018,368.99
  5. Step 5: Solve for x
    x = 218,018,368.99/20,971.56
  6. Step 6: Final answer
    x = 10,395.91

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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.