Home / 20,915.86-31,378.47-7,064.50

Finding the Fourth Proportional to 20,915.86, 31,378.47 and 7,064.50

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Solution

The fourth proportional to 20,915.86, 31,378.47 and 7,064.50 is: 10,598.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,915.86 : 31,378.47 = 7,064.50 : x
  2. Step 2: Convert to fraction form
    20,915.86/31,378.47 = 7,064.50/x
  3. Step 3: Cross multiply
    20,915.86x = 31,378.47 × 7,064.50
  4. Step 4: Simplify right side
    20,915.86x = 221,673,201.32
  5. Step 5: Solve for x
    x = 221,673,201.32/20,915.86
  6. Step 6: Final answer
    x = 10,598.33

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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.