Home / 21,125.50-31,688.70-7,984.06

Finding the Fourth Proportional to 21,125.50, 31,688.70 and 7,984.06

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Solution

The fourth proportional to 21,125.50, 31,688.70 and 7,984.06 is: 11,976.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,125.50 : 31,688.70 = 7,984.06 : x
  2. Step 2: Convert to fraction form
    21,125.50/31,688.70 = 7,984.06/x
  3. Step 3: Cross multiply
    21,125.50x = 31,688.70 × 7,984.06
  4. Step 4: Simplify right side
    21,125.50x = 253,004,482.12
  5. Step 5: Solve for x
    x = 253,004,482.12/21,125.50
  6. Step 6: Final answer
    x = 11,976.26

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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.