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Finding the Fourth Proportional to 899.55, 1,240.86 and 545.31

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Solution

The fourth proportional to 899.55, 1,240.86 and 545.31 is: 752.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.55 : 1,240.86 = 545.31 : x
  2. Step 2: Convert to fraction form
    899.55/1,240.86 = 545.31/x
  3. Step 3: Cross multiply
    899.55x = 1,240.86 × 545.31
  4. Step 4: Simplify right side
    899.55x = 676,653.37
  5. Step 5: Solve for x
    x = 676,653.37/899.55
  6. Step 6: Final answer
    x = 752.21

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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.