Home / 20,403.08-28,160.64-15,570.36

Finding the Fourth Proportional to 20,403.08, 28,160.64 and 15,570.36

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Solution

The fourth proportional to 20,403.08, 28,160.64 and 15,570.36 is: 21,490.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,403.08 : 28,160.64 = 15,570.36 : x
  2. Step 2: Convert to fraction form
    20,403.08/28,160.64 = 15,570.36/x
  3. Step 3: Cross multiply
    20,403.08x = 28,160.64 × 15,570.36
  4. Step 4: Simplify right side
    20,403.08x = 438,471,302.63
  5. Step 5: Solve for x
    x = 438,471,302.63/20,403.08
  6. Step 6: Final answer
    x = 21,490.45

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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.