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Finding the Fourth Proportional to 756.34, 1,042.78 and 623.10

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Solution

The fourth proportional to 756.34, 1,042.78 and 623.10 is: 859.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.34 : 1,042.78 = 623.10 : x
  2. Step 2: Convert to fraction form
    756.34/1,042.78 = 623.10/x
  3. Step 3: Cross multiply
    756.34x = 1,042.78 × 623.10
  4. Step 4: Simplify right side
    756.34x = 649,756.22
  5. Step 5: Solve for x
    x = 649,756.22/756.34
  6. Step 6: Final answer
    x = 859.08

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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.