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Finding the Fourth Proportional to 1,225.90, 1,693.96 and 893.74

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Solution

The fourth proportional to 1,225.90, 1,693.96 and 893.74 is: 1,234.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,225.90 : 1,693.96 = 893.74 : x
  2. Step 2: Convert to fraction form
    1,225.90/1,693.96 = 893.74/x
  3. Step 3: Cross multiply
    1,225.90x = 1,693.96 × 893.74
  4. Step 4: Simplify right side
    1,225.90x = 1,513,959.81
  5. Step 5: Solve for x
    x = 1,513,959.81/1,225.90
  6. Step 6: Final answer
    x = 1,234.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.