Home / 21,678.57-29,915.79-12,118.47

Finding the Fourth Proportional to 21,678.57, 29,915.79 and 12,118.47

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Solution

The fourth proportional to 21,678.57, 29,915.79 and 12,118.47 is: 16,723.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.57 : 29,915.79 = 12,118.47 : x
  2. Step 2: Convert to fraction form
    21,678.57/29,915.79 = 12,118.47/x
  3. Step 3: Cross multiply
    21,678.57x = 29,915.79 × 12,118.47
  4. Step 4: Simplify right side
    21,678.57x = 362,533,603.64
  5. Step 5: Solve for x
    x = 362,533,603.64/21,678.57
  6. Step 6: Final answer
    x = 16,723.13

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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.