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Finding the Fourth Proportional to 917.79, 1,376.40 and 655.60

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Solution

The fourth proportional to 917.79, 1,376.40 and 655.60 is: 983.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.79 : 1,376.40 = 655.60 : x
  2. Step 2: Convert to fraction form
    917.79/1,376.40 = 655.60/x
  3. Step 3: Cross multiply
    917.79x = 1,376.40 × 655.60
  4. Step 4: Simplify right side
    917.79x = 902,367.84
  5. Step 5: Solve for x
    x = 902,367.84/917.79
  6. Step 6: Final answer
    x = 983.20

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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.