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Finding the Fourth Proportional to 920.70, 1,270.36 and 561.98

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Solution

The fourth proportional to 920.70, 1,270.36 and 561.98 is: 775.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.70 : 1,270.36 = 561.98 : x
  2. Step 2: Convert to fraction form
    920.70/1,270.36 = 561.98/x
  3. Step 3: Cross multiply
    920.70x = 1,270.36 × 561.98
  4. Step 4: Simplify right side
    920.70x = 713,910.28
  5. Step 5: Solve for x
    x = 713,910.28/920.70
  6. Step 6: Final answer
    x = 775.40

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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.