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Finding the Fourth Proportional to 1,239.50, 1,854.90 and 847.67

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Solution

The fourth proportional to 1,239.50, 1,854.90 and 847.67 is: 1,268.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.50 : 1,854.90 = 847.67 : x
  2. Step 2: Convert to fraction form
    1,239.50/1,854.90 = 847.67/x
  3. Step 3: Cross multiply
    1,239.50x = 1,854.90 × 847.67
  4. Step 4: Simplify right side
    1,239.50x = 1,572,333.81
  5. Step 5: Solve for x
    x = 1,572,333.81/1,239.50
  6. Step 6: Final answer
    x = 1,268.52

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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.