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Finding the Fourth Proportional to 1,038.48, 1,432.55 and 640.23

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Solution

The fourth proportional to 1,038.48, 1,432.55 and 640.23 is: 883.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,038.48 : 1,432.55 = 640.23 : x
  2. Step 2: Convert to fraction form
    1,038.48/1,432.55 = 640.23/x
  3. Step 3: Cross multiply
    1,038.48x = 1,432.55 × 640.23
  4. Step 4: Simplify right side
    1,038.48x = 917,165.09
  5. Step 5: Solve for x
    x = 917,165.09/1,038.48
  6. Step 6: Final answer
    x = 883.18

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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.