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Finding the Fourth Proportional to 1,587.50, 2,379.74 and 613.38

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Solution

The fourth proportional to 1,587.50, 2,379.74 and 613.38 is: 919.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.50 : 2,379.74 = 613.38 : x
  2. Step 2: Convert to fraction form
    1,587.50/2,379.74 = 613.38/x
  3. Step 3: Cross multiply
    1,587.50x = 2,379.74 × 613.38
  4. Step 4: Simplify right side
    1,587.50x = 1,459,681.85
  5. Step 5: Solve for x
    x = 1,459,681.85/1,587.50
  6. Step 6: Final answer
    x = 919.49

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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.