Home / 20,897.80-31,346.70-12,603.40

Finding the Fourth Proportional to 20,897.80, 31,346.70 and 12,603.40

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Solution

The fourth proportional to 20,897.80, 31,346.70 and 12,603.40 is: 18,905.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,897.80 : 31,346.70 = 12,603.40 : x
  2. Step 2: Convert to fraction form
    20,897.80/31,346.70 = 12,603.40/x
  3. Step 3: Cross multiply
    20,897.80x = 31,346.70 × 12,603.40
  4. Step 4: Simplify right side
    20,897.80x = 395,074,998.78
  5. Step 5: Solve for x
    x = 395,074,998.78/20,897.80
  6. Step 6: Final answer
    x = 18,905.10

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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.