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Finding the Fourth Proportional to 1,010.20, 1,393.84 and 637.60

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Solution

The fourth proportional to 1,010.20, 1,393.84 and 637.60 is: 879.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,010.20 : 1,393.84 = 637.60 : x
  2. Step 2: Convert to fraction form
    1,010.20/1,393.84 = 637.60/x
  3. Step 3: Cross multiply
    1,010.20x = 1,393.84 × 637.60
  4. Step 4: Simplify right side
    1,010.20x = 888,712.38
  5. Step 5: Solve for x
    x = 888,712.38/1,010.20
  6. Step 6: Final answer
    x = 879.74

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1.5x scale

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.