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Finding the Fourth Proportional to 720.96, 994.30 and 555.60

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Solution

The fourth proportional to 720.96, 994.30 and 555.60 is: 766.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.96 : 994.30 = 555.60 : x
  2. Step 2: Convert to fraction form
    720.96/994.30 = 555.60/x
  3. Step 3: Cross multiply
    720.96x = 994.30 × 555.60
  4. Step 4: Simplify right side
    720.96x = 552,433.08
  5. Step 5: Solve for x
    x = 552,433.08/720.96
  6. Step 6: Final answer
    x = 766.25

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1.5x scale

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.