Home / 20,920.95-28,870.91-11,489.51

Finding the Fourth Proportional to 20,920.95, 28,870.91 and 11,489.51

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Solution

The fourth proportional to 20,920.95, 28,870.91 and 11,489.51 is: 15,855.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.95 : 28,870.91 = 11,489.51 : x
  2. Step 2: Convert to fraction form
    20,920.95/28,870.91 = 11,489.51/x
  3. Step 3: Cross multiply
    20,920.95x = 28,870.91 × 11,489.51
  4. Step 4: Simplify right side
    20,920.95x = 331,712,551.71
  5. Step 5: Solve for x
    x = 331,712,551.71/20,920.95
  6. Step 6: Final answer
    x = 15,855.52

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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.