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Finding the Fourth Proportional to 1,620.95, 2,431.51 and 525.40

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Solution

The fourth proportional to 1,620.95, 2,431.51 and 525.40 is: 788.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.95 : 2,431.51 = 525.40 : x
  2. Step 2: Convert to fraction form
    1,620.95/2,431.51 = 525.40/x
  3. Step 3: Cross multiply
    1,620.95x = 2,431.51 × 525.40
  4. Step 4: Simplify right side
    1,620.95x = 1,277,507.96
  5. Step 5: Solve for x
    x = 1,277,507.96/1,620.95
  6. Step 6: Final answer
    x = 788.13

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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.