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Finding the Fourth Proportional to 1,585.65, 2,378.81 and 545.75

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Solution

The fourth proportional to 1,585.65, 2,378.81 and 545.75 is: 818.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.65 : 2,378.81 = 545.75 : x
  2. Step 2: Convert to fraction form
    1,585.65/2,378.81 = 545.75/x
  3. Step 3: Cross multiply
    1,585.65x = 2,378.81 × 545.75
  4. Step 4: Simplify right side
    1,585.65x = 1,298,233.95
  5. Step 5: Solve for x
    x = 1,298,233.95/1,585.65
  6. Step 6: Final answer
    x = 818.74

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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.