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Finding the Fourth Proportional to 874.80, 1,207.07 and 708.75

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Solution

The fourth proportional to 874.80, 1,207.07 and 708.75 is: 977.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    874.80 : 1,207.07 = 708.75 : x
  2. Step 2: Convert to fraction form
    874.80/1,207.07 = 708.75/x
  3. Step 3: Cross multiply
    874.80x = 1,207.07 × 708.75
  4. Step 4: Simplify right side
    874.80x = 855,509.98
  5. Step 5: Solve for x
    x = 855,509.98/874.80
  6. Step 6: Final answer
    x = 977.95

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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.