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Finding the Fourth Proportional to 1,110.55, 1,664.20 and 623.74

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Solution

The fourth proportional to 1,110.55, 1,664.20 and 623.74 is: 934.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,110.55 : 1,664.20 = 623.74 : x
  2. Step 2: Convert to fraction form
    1,110.55/1,664.20 = 623.74/x
  3. Step 3: Cross multiply
    1,110.55x = 1,664.20 × 623.74
  4. Step 4: Simplify right side
    1,110.55x = 1,038,028.11
  5. Step 5: Solve for x
    x = 1,038,028.11/1,110.55
  6. Step 6: Final answer
    x = 934.70

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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.