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Finding the Fourth Proportional to 877.39, 1,210.78 and 625.78

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Solution

The fourth proportional to 877.39, 1,210.78 and 625.78 is: 863.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.39 : 1,210.78 = 625.78 : x
  2. Step 2: Convert to fraction form
    877.39/1,210.78 = 625.78/x
  3. Step 3: Cross multiply
    877.39x = 1,210.78 × 625.78
  4. Step 4: Simplify right side
    877.39x = 757,681.91
  5. Step 5: Solve for x
    x = 757,681.91/877.39
  6. Step 6: Final answer
    x = 863.56

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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.