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Finding the Fourth Proportional to 920.61, 1,270.43 and 561.60

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Solution

The fourth proportional to 920.61, 1,270.43 and 561.60 is: 775.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.61 : 1,270.43 = 561.60 : x
  2. Step 2: Convert to fraction form
    920.61/1,270.43 = 561.60/x
  3. Step 3: Cross multiply
    920.61x = 1,270.43 × 561.60
  4. Step 4: Simplify right side
    920.61x = 713,473.49
  5. Step 5: Solve for x
    x = 713,473.49/920.61
  6. Step 6: Final answer
    x = 775.00

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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.