Home / 12,905.40-19,358.10-9,985.80

Finding the Fourth Proportional to 12,905.40, 19,358.10 and 9,985.80

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Solution

The fourth proportional to 12,905.40, 19,358.10 and 9,985.80 is: 14,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.40 : 19,358.10 = 9,985.80 : x
  2. Step 2: Convert to fraction form
    12,905.40/19,358.10 = 9,985.80/x
  3. Step 3: Cross multiply
    12,905.40x = 19,358.10 × 9,985.80
  4. Step 4: Simplify right side
    12,905.40x = 193,306,114.98
  5. Step 5: Solve for x
    x = 193,306,114.98/12,905.40
  6. Step 6: Final answer
    x = 14,978.70

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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.