Home / 22,420.80-30,931.20-12,985.92

Finding the Fourth Proportional to 22,420.80, 30,931.20 and 12,985.92

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Solution

The fourth proportional to 22,420.80, 30,931.20 and 12,985.92 is: 17,915.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,420.80 : 30,931.20 = 12,985.92 : x
  2. Step 2: Convert to fraction form
    22,420.80/30,931.20 = 12,985.92/x
  3. Step 3: Cross multiply
    22,420.80x = 30,931.20 × 12,985.92
  4. Step 4: Simplify right side
    22,420.80x = 401,670,088.70
  5. Step 5: Solve for x
    x = 401,670,088.70/22,420.80
  6. Step 6: Final answer
    x = 17,915.06

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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.