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Finding the Fourth Proportional to 1,298.61, 1,792.98 and 1,215.99

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Solution

The fourth proportional to 1,298.61, 1,792.98 and 1,215.99 is: 1,678.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,298.61 : 1,792.98 = 1,215.99 : x
  2. Step 2: Convert to fraction form
    1,298.61/1,792.98 = 1,215.99/x
  3. Step 3: Cross multiply
    1,298.61x = 1,792.98 × 1,215.99
  4. Step 4: Simplify right side
    1,298.61x = 2,180,245.75
  5. Step 5: Solve for x
    x = 2,180,245.75/1,298.61
  6. Step 6: Final answer
    x = 1,678.91

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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.