Home / 21,483.86-29,640.60-12,988.58

Finding the Fourth Proportional to 21,483.86, 29,640.60 and 12,988.58

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Solution

The fourth proportional to 21,483.86, 29,640.60 and 12,988.58 is: 17,919.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,483.86 : 29,640.60 = 12,988.58 : x
  2. Step 2: Convert to fraction form
    21,483.86/29,640.60 = 12,988.58/x
  3. Step 3: Cross multiply
    21,483.86x = 29,640.60 × 12,988.58
  4. Step 4: Simplify right side
    21,483.86x = 384,989,156.15
  5. Step 5: Solve for x
    x = 384,989,156.15/21,483.86
  6. Step 6: Final answer
    x = 17,919.93

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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.