Home / 21,816.65-30,106.55-12,864.53

Finding the Fourth Proportional to 21,816.65, 30,106.55 and 12,864.53

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Solution

The fourth proportional to 21,816.65, 30,106.55 and 12,864.53 is: 17,752.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,816.65 : 30,106.55 = 12,864.53 : x
  2. Step 2: Convert to fraction form
    21,816.65/30,106.55 = 12,864.53/x
  3. Step 3: Cross multiply
    21,816.65x = 30,106.55 × 12,864.53
  4. Step 4: Simplify right side
    21,816.65x = 387,306,551.35
  5. Step 5: Solve for x
    x = 387,306,551.35/21,816.65
  6. Step 6: Final answer
    x = 17,752.80

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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.