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Finding the Fourth Proportional to 923.70, 1,385.55 and 558.30

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Solution

The fourth proportional to 923.70, 1,385.55 and 558.30 is: 837.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.70 : 1,385.55 = 558.30 : x
  2. Step 2: Convert to fraction form
    923.70/1,385.55 = 558.30/x
  3. Step 3: Cross multiply
    923.70x = 1,385.55 × 558.30
  4. Step 4: Simplify right side
    923.70x = 773,552.57
  5. Step 5: Solve for x
    x = 773,552.57/923.70
  6. Step 6: Final answer
    x = 837.45

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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.