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Finding the Fourth Proportional to 877.84, 1,211.50 and 656.40

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Solution

The fourth proportional to 877.84, 1,211.50 and 656.40 is: 905.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.84 : 1,211.50 = 656.40 : x
  2. Step 2: Convert to fraction form
    877.84/1,211.50 = 656.40/x
  3. Step 3: Cross multiply
    877.84x = 1,211.50 × 656.40
  4. Step 4: Simplify right side
    877.84x = 795,228.60
  5. Step 5: Solve for x
    x = 795,228.60/877.84
  6. Step 6: Final answer
    x = 905.89

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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.