Home / 15,878.72-21,904.80-12,897.92

Finding the Fourth Proportional to 15,878.72, 21,904.80 and 12,897.92

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Solution

The fourth proportional to 15,878.72, 21,904.80 and 12,897.92 is: 17,792.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,878.72 : 21,904.80 = 12,897.92 : x
  2. Step 2: Convert to fraction form
    15,878.72/21,904.80 = 12,897.92/x
  3. Step 3: Cross multiply
    15,878.72x = 21,904.80 × 12,897.92
  4. Step 4: Simplify right side
    15,878.72x = 282,526,358.02
  5. Step 5: Solve for x
    x = 282,526,358.02/15,878.72
  6. Step 6: Final answer
    x = 17,792.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.