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Finding the Fourth Proportional to 927.15, 1,388.70 and 561.30

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Solution

The fourth proportional to 927.15, 1,388.70 and 561.30 is: 840.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.15 : 1,388.70 = 561.30 : x
  2. Step 2: Convert to fraction form
    927.15/1,388.70 = 561.30/x
  3. Step 3: Cross multiply
    927.15x = 1,388.70 × 561.30
  4. Step 4: Simplify right side
    927.15x = 779,477.31
  5. Step 5: Solve for x
    x = 779,477.31/927.15
  6. Step 6: Final answer
    x = 840.72

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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.