Home / 28,355.70-39,130.05-15,780.18

Finding the Fourth Proportional to 28,355.70, 39,130.05 and 15,780.18

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Solution

The fourth proportional to 28,355.70, 39,130.05 and 15,780.18 is: 21,776.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.70 : 39,130.05 = 15,780.18 : x
  2. Step 2: Convert to fraction form
    28,355.70/39,130.05 = 15,780.18/x
  3. Step 3: Cross multiply
    28,355.70x = 39,130.05 × 15,780.18
  4. Step 4: Simplify right side
    28,355.70x = 617,479,232.41
  5. Step 5: Solve for x
    x = 617,479,232.41/28,355.70
  6. Step 6: Final answer
    x = 21,776.19

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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.