Home / 1,621.29-2,432.23-647.40

Finding the Fourth Proportional to 1,621.29, 2,432.23 and 647.40

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Solution

The fourth proportional to 1,621.29, 2,432.23 and 647.40 is: 971.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,621.29 : 2,432.23 = 647.40 : x
  2. Step 2: Convert to fraction form
    1,621.29/2,432.23 = 647.40/x
  3. Step 3: Cross multiply
    1,621.29x = 2,432.23 × 647.40
  4. Step 4: Simplify right side
    1,621.29x = 1,574,613.54
  5. Step 5: Solve for x
    x = 1,574,613.54/1,621.29
  6. Step 6: Final answer
    x = 971.21

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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.