Home / 20,657.10-30,985.65-12,870.30

Finding the Fourth Proportional to 20,657.10, 30,985.65 and 12,870.30

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Solution

The fourth proportional to 20,657.10, 30,985.65 and 12,870.30 is: 19,305.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,657.10 : 30,985.65 = 12,870.30 : x
  2. Step 2: Convert to fraction form
    20,657.10/30,985.65 = 12,870.30/x
  3. Step 3: Cross multiply
    20,657.10x = 30,985.65 × 12,870.30
  4. Step 4: Simplify right side
    20,657.10x = 398,794,611.20
  5. Step 5: Solve for x
    x = 398,794,611.20/20,657.10
  6. Step 6: Final answer
    x = 19,305.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.