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Finding the Fourth Proportional to 899.07, 1,240.71 and 637.53

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Solution

The fourth proportional to 899.07, 1,240.71 and 637.53 is: 879.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.07 : 1,240.71 = 637.53 : x
  2. Step 2: Convert to fraction form
    899.07/1,240.71 = 637.53/x
  3. Step 3: Cross multiply
    899.07x = 1,240.71 × 637.53
  4. Step 4: Simplify right side
    899.07x = 790,989.85
  5. Step 5: Solve for x
    x = 790,989.85/899.07
  6. Step 6: Final answer
    x = 879.79

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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.