Home / 21,780.05-30,045.40-14,230.80

Finding the Fourth Proportional to 21,780.05, 30,045.40 and 14,230.80

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Solution

The fourth proportional to 21,780.05, 30,045.40 and 14,230.80 is: 19,631.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,780.05 : 30,045.40 = 14,230.80 : x
  2. Step 2: Convert to fraction form
    21,780.05/30,045.40 = 14,230.80/x
  3. Step 3: Cross multiply
    21,780.05x = 30,045.40 × 14,230.80
  4. Step 4: Simplify right side
    21,780.05x = 427,569,931.06
  5. Step 5: Solve for x
    x = 427,569,931.06/21,780.05
  6. Step 6: Final answer
    x = 19,631.27

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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.