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Finding the Fourth Proportional to 25,457, 35,130.72 and 15,521

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Solution

The fourth proportional to 25,457, 35,130.72 and 15,521 is: 21,419.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,457 : 35,130.72 = 15,521 : x
  2. Step 2: Convert to fraction form
    25,457/35,130.72 = 15,521/x
  3. Step 3: Cross multiply
    25,457x = 35,130.72 × 15,521
  4. Step 4: Simplify right side
    25,457x = 545,263,905.12
  5. Step 5: Solve for x
    x = 545,263,905.12/25,457
  6. Step 6: Final answer
    x = 21,419.02

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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.