Home / 20,929.66-28,870.12-12,426.01

Finding the Fourth Proportional to 20,929.66, 28,870.12 and 12,426.01

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Solution

The fourth proportional to 20,929.66, 28,870.12 and 12,426.01 is: 17,140.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,929.66 : 28,870.12 = 12,426.01 : x
  2. Step 2: Convert to fraction form
    20,929.66/28,870.12 = 12,426.01/x
  3. Step 3: Cross multiply
    20,929.66x = 28,870.12 × 12,426.01
  4. Step 4: Simplify right side
    20,929.66x = 358,740,399.82
  5. Step 5: Solve for x
    x = 358,740,399.82/20,929.66
  6. Step 6: Final answer
    x = 17,140.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.