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Finding the Fourth Proportional to 611.60, 917.40 and 605.20

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Solution

The fourth proportional to 611.60, 917.40 and 605.20 is: 907.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.60 : 917.40 = 605.20 : x
  2. Step 2: Convert to fraction form
    611.60/917.40 = 605.20/x
  3. Step 3: Cross multiply
    611.60x = 917.40 × 605.20
  4. Step 4: Simplify right side
    611.60x = 555,210.48
  5. Step 5: Solve for x
    x = 555,210.48/611.60
  6. Step 6: Final answer
    x = 907.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.