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Finding the Fourth Proportional to 615.60, 939.60 and 615.60

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Solution

The fourth proportional to 615.60, 939.60 and 615.60 is: 939.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.60 : 939.60 = 615.60 : x
  2. Step 2: Convert to fraction form
    615.60/939.60 = 615.60/x
  3. Step 3: Cross multiply
    615.60x = 939.60 × 615.60
  4. Step 4: Simplify right side
    615.60x = 578,417.76
  5. Step 5: Solve for x
    x = 578,417.76/615.60
  6. Step 6: Final answer
    x = 939.60

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.