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Finding the Fourth Proportional to 926.40, 1,389.76 and 277.12

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Solution

The fourth proportional to 926.40, 1,389.76 and 277.12 is: 415.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.40 : 1,389.76 = 277.12 : x
  2. Step 2: Convert to fraction form
    926.40/1,389.76 = 277.12/x
  3. Step 3: Cross multiply
    926.40x = 1,389.76 × 277.12
  4. Step 4: Simplify right side
    926.40x = 385,130.29
  5. Step 5: Solve for x
    x = 385,130.29/926.40
  6. Step 6: Final answer
    x = 415.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.