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Finding the Fourth Proportional to 756.18, 1,042.98 and 657.72

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Solution

The fourth proportional to 756.18, 1,042.98 and 657.72 is: 907.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.18 : 1,042.98 = 657.72 : x
  2. Step 2: Convert to fraction form
    756.18/1,042.98 = 657.72/x
  3. Step 3: Cross multiply
    756.18x = 1,042.98 × 657.72
  4. Step 4: Simplify right side
    756.18x = 685,988.81
  5. Step 5: Solve for x
    x = 685,988.81/756.18
  6. Step 6: Final answer
    x = 907.18

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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.