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Finding the Fourth Proportional to 1,638.90, 2,457.90 and 598.71

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Solution

The fourth proportional to 1,638.90, 2,457.90 and 598.71 is: 897.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.90 : 2,457.90 = 598.71 : x
  2. Step 2: Convert to fraction form
    1,638.90/2,457.90 = 598.71/x
  3. Step 3: Cross multiply
    1,638.90x = 2,457.90 × 598.71
  4. Step 4: Simplify right side
    1,638.90x = 1,471,569.31
  5. Step 5: Solve for x
    x = 1,471,569.31/1,638.90
  6. Step 6: Final answer
    x = 897.90

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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.