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Finding the Fourth Proportional to 1,140.80, 1,712 and 491.84

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Solution

The fourth proportional to 1,140.80, 1,712 and 491.84 is: 738.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.80 : 1,712 = 491.84 : x
  2. Step 2: Convert to fraction form
    1,140.80/1,712 = 491.84/x
  3. Step 3: Cross multiply
    1,140.80x = 1,712 × 491.84
  4. Step 4: Simplify right side
    1,140.80x = 842,030.08
  5. Step 5: Solve for x
    x = 842,030.08/1,140.80
  6. Step 6: Final answer
    x = 738.10

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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.