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Finding the Fourth Proportional to 1,551.18, 2,140.74 and 992.16

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Solution

The fourth proportional to 1,551.18, 2,140.74 and 992.16 is: 1,369.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,551.18 : 2,140.74 = 992.16 : x
  2. Step 2: Convert to fraction form
    1,551.18/2,140.74 = 992.16/x
  3. Step 3: Cross multiply
    1,551.18x = 2,140.74 × 992.16
  4. Step 4: Simplify right side
    1,551.18x = 2,123,956.60
  5. Step 5: Solve for x
    x = 2,123,956.60/1,551.18
  6. Step 6: Final answer
    x = 1,369.25

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.