Home / 21,038.91-31,600.40-13,155.45

Finding the Fourth Proportional to 21,038.91, 31,600.40 and 13,155.45

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Solution

The fourth proportional to 21,038.91, 31,600.40 and 13,155.45 is: 19,759.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,038.91 : 31,600.40 = 13,155.45 : x
  2. Step 2: Convert to fraction form
    21,038.91/31,600.40 = 13,155.45/x
  3. Step 3: Cross multiply
    21,038.91x = 31,600.40 × 13,155.45
  4. Step 4: Simplify right side
    21,038.91x = 415,717,297.90
  5. Step 5: Solve for x
    x = 415,717,297.90/21,038.91
  6. Step 6: Final answer
    x = 19,759.45

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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.