Home / 20,688.12-28,545.24-13,528.53

Finding the Fourth Proportional to 20,688.12, 28,545.24 and 13,528.53

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Solution

The fourth proportional to 20,688.12, 28,545.24 and 13,528.53 is: 18,666.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,688.12 : 28,545.24 = 13,528.53 : x
  2. Step 2: Convert to fraction form
    20,688.12/28,545.24 = 13,528.53/x
  3. Step 3: Cross multiply
    20,688.12x = 28,545.24 × 13,528.53
  4. Step 4: Simplify right side
    20,688.12x = 386,174,925.33
  5. Step 5: Solve for x
    x = 386,174,925.33/20,688.12
  6. Step 6: Final answer
    x = 18,666.51

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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.