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Finding the Fourth Proportional to 753.15, 1,038.92 and 543.09

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Solution

The fourth proportional to 753.15, 1,038.92 and 543.09 is: 749.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.15 : 1,038.92 = 543.09 : x
  2. Step 2: Convert to fraction form
    753.15/1,038.92 = 543.09/x
  3. Step 3: Cross multiply
    753.15x = 1,038.92 × 543.09
  4. Step 4: Simplify right side
    753.15x = 564,224.35
  5. Step 5: Solve for x
    x = 564,224.35/753.15
  6. Step 6: Final answer
    x = 749.15

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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.