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Finding the Fourth Proportional to 12,985.80, 19,478.70 and 12,337.80

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Solution

The fourth proportional to 12,985.80, 19,478.70 and 12,337.80 is: 18,506.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,985.80 : 19,478.70 = 12,337.80 : x
  2. Step 2: Convert to fraction form
    12,985.80/19,478.70 = 12,337.80/x
  3. Step 3: Cross multiply
    12,985.80x = 19,478.70 × 12,337.80
  4. Step 4: Simplify right side
    12,985.80x = 240,324,304.86
  5. Step 5: Solve for x
    x = 240,324,304.86/12,985.80
  6. Step 6: Final answer
    x = 18,506.70

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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.