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Finding the Fourth Proportional to 20,316, 28,047.60 and 15,339.36

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Solution

The fourth proportional to 20,316, 28,047.60 and 15,339.36 is: 21,177.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,316 : 28,047.60 = 15,339.36 : x
  2. Step 2: Convert to fraction form
    20,316/28,047.60 = 15,339.36/x
  3. Step 3: Cross multiply
    20,316x = 28,047.60 × 15,339.36
  4. Step 4: Simplify right side
    20,316x = 430,232,233.54
  5. Step 5: Solve for x
    x = 430,232,233.54/20,316
  6. Step 6: Final answer
    x = 21,177.01

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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.