Home / 20,807.40-31,211.10-12,037.80

Finding the Fourth Proportional to 20,807.40, 31,211.10 and 12,037.80

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Solution

The fourth proportional to 20,807.40, 31,211.10 and 12,037.80 is: 18,056.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,807.40 : 31,211.10 = 12,037.80 : x
  2. Step 2: Convert to fraction form
    20,807.40/31,211.10 = 12,037.80/x
  3. Step 3: Cross multiply
    20,807.40x = 31,211.10 × 12,037.80
  4. Step 4: Simplify right side
    20,807.40x = 375,712,979.58
  5. Step 5: Solve for x
    x = 375,712,979.58/20,807.40
  6. Step 6: Final answer
    x = 18,056.70

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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.