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Finding the Fourth Proportional to 708.20, 977.24 and 561.20

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Solution

The fourth proportional to 708.20, 977.24 and 561.20 is: 774.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.20 : 977.24 = 561.20 : x
  2. Step 2: Convert to fraction form
    708.20/977.24 = 561.20/x
  3. Step 3: Cross multiply
    708.20x = 977.24 × 561.20
  4. Step 4: Simplify right side
    708.20x = 548,427.09
  5. Step 5: Solve for x
    x = 548,427.09/708.20
  6. Step 6: Final answer
    x = 774.40

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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.