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Finding the Fourth Proportional to 918.39, 1,267.38 and 525.45

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Solution

The fourth proportional to 918.39, 1,267.38 and 525.45 is: 725.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.39 : 1,267.38 = 525.45 : x
  2. Step 2: Convert to fraction form
    918.39/1,267.38 = 525.45/x
  3. Step 3: Cross multiply
    918.39x = 1,267.38 × 525.45
  4. Step 4: Simplify right side
    918.39x = 665,944.82
  5. Step 5: Solve for x
    x = 665,944.82/918.39
  6. Step 6: Final answer
    x = 725.12

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Double scale
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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.