Home / 21,678.02-29,915.28-12,117.30

Finding the Fourth Proportional to 21,678.02, 29,915.28 and 12,117.30

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Solution

The fourth proportional to 21,678.02, 29,915.28 and 12,117.30 is: 16,721.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,678.02 : 29,915.28 = 12,117.30 : x
  2. Step 2: Convert to fraction form
    21,678.02/29,915.28 = 12,117.30/x
  3. Step 3: Cross multiply
    21,678.02x = 29,915.28 × 12,117.30
  4. Step 4: Simplify right side
    21,678.02x = 362,492,422.34
  5. Step 5: Solve for x
    x = 362,492,422.34/21,678.02
  6. Step 6: Final answer
    x = 16,721.66

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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.