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Finding the Fourth Proportional to 1,665.65, 2,298.65 and 919.61

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Solution

The fourth proportional to 1,665.65, 2,298.65 and 919.61 is: 1,269.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,665.65 : 2,298.65 = 919.61 : x
  2. Step 2: Convert to fraction form
    1,665.65/2,298.65 = 919.61/x
  3. Step 3: Cross multiply
    1,665.65x = 2,298.65 × 919.61
  4. Step 4: Simplify right side
    1,665.65x = 2,113,854.06
  5. Step 5: Solve for x
    x = 2,113,854.06/1,665.65
  6. Step 6: Final answer
    x = 1,269.08

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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.