Home / 12,905.40-19,358.10-12,686.70

Finding the Fourth Proportional to 12,905.40, 19,358.10 and 12,686.70

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Solution

The fourth proportional to 12,905.40, 19,358.10 and 12,686.70 is: 19,030.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905.40 : 19,358.10 = 12,686.70 : x
  2. Step 2: Convert to fraction form
    12,905.40/19,358.10 = 12,686.70/x
  3. Step 3: Cross multiply
    12,905.40x = 19,358.10 × 12,686.70
  4. Step 4: Simplify right side
    12,905.40x = 245,590,407.27
  5. Step 5: Solve for x
    x = 245,590,407.27/12,905.40
  6. Step 6: Final answer
    x = 19,030.05

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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.