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Finding the Fourth Proportional to 3,712, 5,570.56 and 1,280

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Solution

The fourth proportional to 3,712, 5,570.56 and 1,280 is: 1,920.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,712 : 5,570.56 = 1,280 : x
  2. Step 2: Convert to fraction form
    3,712/5,570.56 = 1,280/x
  3. Step 3: Cross multiply
    3,712x = 5,570.56 × 1,280
  4. Step 4: Simplify right side
    3,712x = 7,130,316.80
  5. Step 5: Solve for x
    x = 7,130,316.80/3,712
  6. Step 6: Final answer
    x = 1,920.88

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.