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Finding the Fourth Proportional to 933.34, 1,287.31 and 891.98

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Solution

The fourth proportional to 933.34, 1,287.31 and 891.98 is: 1,230.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.34 : 1,287.31 = 891.98 : x
  2. Step 2: Convert to fraction form
    933.34/1,287.31 = 891.98/x
  3. Step 3: Cross multiply
    933.34x = 1,287.31 × 891.98
  4. Step 4: Simplify right side
    933.34x = 1,148,254.77
  5. Step 5: Solve for x
    x = 1,148,254.77/933.34
  6. Step 6: Final answer
    x = 1,230.26

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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.