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Finding the Fourth Proportional to 1,971.60, 2,957.45 and 738.78

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Solution

The fourth proportional to 1,971.60, 2,957.45 and 738.78 is: 1,108.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,971.60 : 2,957.45 = 738.78 : x
  2. Step 2: Convert to fraction form
    1,971.60/2,957.45 = 738.78/x
  3. Step 3: Cross multiply
    1,971.60x = 2,957.45 × 738.78
  4. Step 4: Simplify right side
    1,971.60x = 2,184,904.91
  5. Step 5: Solve for x
    x = 2,184,904.91/1,971.60
  6. Step 6: Final answer
    x = 1,108.19

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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.