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Finding the Fourth Proportional to 899.10, 1,240.69 and 500.74

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Solution

The fourth proportional to 899.10, 1,240.69 and 500.74 is: 690.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.10 : 1,240.69 = 500.74 : x
  2. Step 2: Convert to fraction form
    899.10/1,240.69 = 500.74/x
  3. Step 3: Cross multiply
    899.10x = 1,240.69 × 500.74
  4. Step 4: Simplify right side
    899.10x = 621,254.40
  5. Step 5: Solve for x
    x = 621,254.40/899.10
  6. Step 6: Final answer
    x = 690.97

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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.