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Finding the Fourth Proportional to 903.30, 1,355.55 and 513.30

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Solution

The fourth proportional to 903.30, 1,355.55 and 513.30 is: 770.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    903.30 : 1,355.55 = 513.30 : x
  2. Step 2: Convert to fraction form
    903.30/1,355.55 = 513.30/x
  3. Step 3: Cross multiply
    903.30x = 1,355.55 × 513.30
  4. Step 4: Simplify right side
    903.30x = 695,803.82
  5. Step 5: Solve for x
    x = 695,803.82/903.30
  6. Step 6: Final answer
    x = 770.29

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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.