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Finding the Fourth Proportional to 53,145.68, 79,715.28 and 21,980.12

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Solution

The fourth proportional to 53,145.68, 79,715.28 and 21,980.12 is: 32,968.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,145.68 : 79,715.28 = 21,980.12 : x
  2. Step 2: Convert to fraction form
    53,145.68/79,715.28 = 21,980.12/x
  3. Step 3: Cross multiply
    53,145.68x = 79,715.28 × 21,980.12
  4. Step 4: Simplify right side
    53,145.68x = 1,752,151,420.23
  5. Step 5: Solve for x
    x = 1,752,151,420.23/53,145.68
  6. Step 6: Final answer
    x = 32,968.84

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.