Home / 20,875.12-28,816.68-12,490

Finding the Fourth Proportional to 20,875.12, 28,816.68 and 12,490

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Solution

The fourth proportional to 20,875.12, 28,816.68 and 12,490 is: 17,241.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,875.12 : 28,816.68 = 12,490 : x
  2. Step 2: Convert to fraction form
    20,875.12/28,816.68 = 12,490/x
  3. Step 3: Cross multiply
    20,875.12x = 28,816.68 × 12,490
  4. Step 4: Simplify right side
    20,875.12x = 359,920,333.20
  5. Step 5: Solve for x
    x = 359,920,333.20/20,875.12
  6. Step 6: Final answer
    x = 17,241.59

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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.