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Finding the Fourth Proportional to 877.59, 1,210.79 and 712.89

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Solution

The fourth proportional to 877.59, 1,210.79 and 712.89 is: 983.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.59 : 1,210.79 = 712.89 : x
  2. Step 2: Convert to fraction form
    877.59/1,210.79 = 712.89/x
  3. Step 3: Cross multiply
    877.59x = 1,210.79 × 712.89
  4. Step 4: Simplify right side
    877.59x = 863,156.52
  5. Step 5: Solve for x
    x = 863,156.52/877.59
  6. Step 6: Final answer
    x = 983.55

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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.