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Finding the Fourth Proportional to 899.33, 1,242.90 and 678.20

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Solution

The fourth proportional to 899.33, 1,242.90 and 678.20 is: 937.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.33 : 1,242.90 = 678.20 : x
  2. Step 2: Convert to fraction form
    899.33/1,242.90 = 678.20/x
  3. Step 3: Cross multiply
    899.33x = 1,242.90 × 678.20
  4. Step 4: Simplify right side
    899.33x = 842,931.39
  5. Step 5: Solve for x
    x = 842,931.39/899.33
  6. Step 6: Final answer
    x = 937.29

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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.