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Finding the Fourth Proportional to 708.53, 977.75 and 393.77

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Solution

The fourth proportional to 708.53, 977.75 and 393.77 is: 543.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    708.53 : 977.75 = 393.77 : x
  2. Step 2: Convert to fraction form
    708.53/977.75 = 393.77/x
  3. Step 3: Cross multiply
    708.53x = 977.75 × 393.77
  4. Step 4: Simplify right side
    708.53x = 385,011.06
  5. Step 5: Solve for x
    x = 385,011.06/708.53
  6. Step 6: Final answer
    x = 543.40

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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.