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Finding the Fourth Proportional to 927.30, 1,389.13 and 561.18

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Solution

The fourth proportional to 927.30, 1,389.13 and 561.18 is: 840.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    927.30 : 1,389.13 = 561.18 : x
  2. Step 2: Convert to fraction form
    927.30/1,389.13 = 561.18/x
  3. Step 3: Cross multiply
    927.30x = 1,389.13 × 561.18
  4. Step 4: Simplify right side
    927.30x = 779,550.57
  5. Step 5: Solve for x
    x = 779,550.57/927.30
  6. Step 6: Final answer
    x = 840.67

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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.