Home / 21,369.90-29,490.03-12,989.10

Finding the Fourth Proportional to 21,369.90, 29,490.03 and 12,989.10

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Solution

The fourth proportional to 21,369.90, 29,490.03 and 12,989.10 is: 17,924.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,369.90 : 29,490.03 = 12,989.10 : x
  2. Step 2: Convert to fraction form
    21,369.90/29,490.03 = 12,989.10/x
  3. Step 3: Cross multiply
    21,369.90x = 29,490.03 × 12,989.10
  4. Step 4: Simplify right side
    21,369.90x = 383,048,948.67
  5. Step 5: Solve for x
    x = 383,048,948.67/21,369.90
  6. Step 6: Final answer
    x = 17,924.70

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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.