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Finding the Fourth Proportional to 903.42, 1,355.43 and 610.91

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Solution

The fourth proportional to 903.42, 1,355.43 and 610.91 is: 916.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.42 : 1,355.43 = 610.91 : x
  2. Step 2: Convert to fraction form
    903.42/1,355.43 = 610.91/x
  3. Step 3: Cross multiply
    903.42x = 1,355.43 × 610.91
  4. Step 4: Simplify right side
    903.42x = 828,038.96
  5. Step 5: Solve for x
    x = 828,038.96/903.42
  6. Step 6: Final answer
    x = 916.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.