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Finding the Fourth Proportional to 1,785.65, 2,679.18 and 553.16

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Solution

The fourth proportional to 1,785.65, 2,679.18 and 553.16 is: 829.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,785.65 : 2,679.18 = 553.16 : x
  2. Step 2: Convert to fraction form
    1,785.65/2,679.18 = 553.16/x
  3. Step 3: Cross multiply
    1,785.65x = 2,679.18 × 553.16
  4. Step 4: Simplify right side
    1,785.65x = 1,482,002.74
  5. Step 5: Solve for x
    x = 1,482,002.74/1,785.65
  6. Step 6: Final answer
    x = 829.95

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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.