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Finding the Fourth Proportional to 1,010.54, 1,395.09 and 678.86

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Solution

The fourth proportional to 1,010.54, 1,395.09 and 678.86 is: 937.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.54 : 1,395.09 = 678.86 : x
  2. Step 2: Convert to fraction form
    1,010.54/1,395.09 = 678.86/x
  3. Step 3: Cross multiply
    1,010.54x = 1,395.09 × 678.86
  4. Step 4: Simplify right side
    1,010.54x = 947,070.80
  5. Step 5: Solve for x
    x = 947,070.80/1,010.54
  6. Step 6: Final answer
    x = 937.19

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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.