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Finding the Fourth Proportional to 918.45, 1,267.20 and 545.40

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Solution

The fourth proportional to 918.45, 1,267.20 and 545.40 is: 752.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.45 : 1,267.20 = 545.40 : x
  2. Step 2: Convert to fraction form
    918.45/1,267.20 = 545.40/x
  3. Step 3: Cross multiply
    918.45x = 1,267.20 × 545.40
  4. Step 4: Simplify right side
    918.45x = 691,130.88
  5. Step 5: Solve for x
    x = 691,130.88/918.45
  6. Step 6: Final answer
    x = 752.50

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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.