Home / 20,981.50-31,477.11-7,130.50

Finding the Fourth Proportional to 20,981.50, 31,477.11 and 7,130.50

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Solution

The fourth proportional to 20,981.50, 31,477.11 and 7,130.50 is: 10,697.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.50 : 31,477.11 = 7,130.50 : x
  2. Step 2: Convert to fraction form
    20,981.50/31,477.11 = 7,130.50/x
  3. Step 3: Cross multiply
    20,981.50x = 31,477.11 × 7,130.50
  4. Step 4: Simplify right side
    20,981.50x = 224,447,532.86
  5. Step 5: Solve for x
    x = 224,447,532.86/20,981.50
  6. Step 6: Final answer
    x = 10,697.40

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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.