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Finding the Fourth Proportional to 1,313.55, 1,970.13 and 491.72

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Solution

The fourth proportional to 1,313.55, 1,970.13 and 491.72 is: 737.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.55 : 1,970.13 = 491.72 : x
  2. Step 2: Convert to fraction form
    1,313.55/1,970.13 = 491.72/x
  3. Step 3: Cross multiply
    1,313.55x = 1,970.13 × 491.72
  4. Step 4: Simplify right side
    1,313.55x = 968,752.32
  5. Step 5: Solve for x
    x = 968,752.32/1,313.55
  6. Step 6: Final answer
    x = 737.51

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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.