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Finding the Fourth Proportional to 887.12, 1,223.72 and 555.66

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Solution

The fourth proportional to 887.12, 1,223.72 and 555.66 is: 766.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.12 : 1,223.72 = 555.66 : x
  2. Step 2: Convert to fraction form
    887.12/1,223.72 = 555.66/x
  3. Step 3: Cross multiply
    887.12x = 1,223.72 × 555.66
  4. Step 4: Simplify right side
    887.12x = 679,969.48
  5. Step 5: Solve for x
    x = 679,969.48/887.12
  6. Step 6: Final answer
    x = 766.50

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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.