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Finding the Fourth Proportional to 920.45, 1,270.08 and 547.42

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Solution

The fourth proportional to 920.45, 1,270.08 and 547.42 is: 755.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.45 : 1,270.08 = 547.42 : x
  2. Step 2: Convert to fraction form
    920.45/1,270.08 = 547.42/x
  3. Step 3: Cross multiply
    920.45x = 1,270.08 × 547.42
  4. Step 4: Simplify right side
    920.45x = 695,267.41
  5. Step 5: Solve for x
    x = 695,267.41/920.45
  6. Step 6: Final answer
    x = 755.35

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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.