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Finding the Fourth Proportional to 656.16, 981.99 and 561.12

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Solution

The fourth proportional to 656.16, 981.99 and 561.12 is: 839.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.16 : 981.99 = 561.12 : x
  2. Step 2: Convert to fraction form
    656.16/981.99 = 561.12/x
  3. Step 3: Cross multiply
    656.16x = 981.99 × 561.12
  4. Step 4: Simplify right side
    656.16x = 551,014.23
  5. Step 5: Solve for x
    x = 551,014.23/656.16
  6. Step 6: Final answer
    x = 839.76

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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.