Home / 1,621.17-2,431.92-647.05

Finding the Fourth Proportional to 1,621.17, 2,431.92 and 647.05

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Solution

The fourth proportional to 1,621.17, 2,431.92 and 647.05 is: 970.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.17 : 2,431.92 = 647.05 : x
  2. Step 2: Convert to fraction form
    1,621.17/2,431.92 = 647.05/x
  3. Step 3: Cross multiply
    1,621.17x = 2,431.92 × 647.05
  4. Step 4: Simplify right side
    1,621.17x = 1,573,573.84
  5. Step 5: Solve for x
    x = 1,573,573.84/1,621.17
  6. Step 6: Final answer
    x = 970.64

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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.