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Finding the Fourth Proportional to 615.60, 919.08 and 561.60

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Solution

The fourth proportional to 615.60, 919.08 and 561.60 is: 838.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.60 : 919.08 = 561.60 : x
  2. Step 2: Convert to fraction form
    615.60/919.08 = 561.60/x
  3. Step 3: Cross multiply
    615.60x = 919.08 × 561.60
  4. Step 4: Simplify right side
    615.60x = 516,155.33
  5. Step 5: Solve for x
    x = 516,155.33/615.60
  6. Step 6: Final answer
    x = 838.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.