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Finding the Fourth Proportional to 927.61, 1,389.32 and 651.20

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Solution

The fourth proportional to 927.61, 1,389.32 and 651.20 is: 975.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.61 : 1,389.32 = 651.20 : x
  2. Step 2: Convert to fraction form
    927.61/1,389.32 = 651.20/x
  3. Step 3: Cross multiply
    927.61x = 1,389.32 × 651.20
  4. Step 4: Simplify right side
    927.61x = 904,717.42
  5. Step 5: Solve for x
    x = 904,717.42/927.61
  6. Step 6: Final answer
    x = 975.32

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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.