Home / 21,178.85-31,748.83-7,318.13

Finding the Fourth Proportional to 21,178.85, 31,748.83 and 7,318.13

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Solution

The fourth proportional to 21,178.85, 31,748.83 and 7,318.13 is: 10,970.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.85 : 31,748.83 = 7,318.13 : x
  2. Step 2: Convert to fraction form
    21,178.85/31,748.83 = 7,318.13/x
  3. Step 3: Cross multiply
    21,178.85x = 31,748.83 × 7,318.13
  4. Step 4: Simplify right side
    21,178.85x = 232,341,888.25
  5. Step 5: Solve for x
    x = 232,341,888.25/21,178.85
  6. Step 6: Final answer
    x = 10,970.47

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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.