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Finding the Fourth Proportional to 1,585.21, 2,376.79 and 661.40

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Solution

The fourth proportional to 1,585.21, 2,376.79 and 661.40 is: 991.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.21 : 2,376.79 = 661.40 : x
  2. Step 2: Convert to fraction form
    1,585.21/2,376.79 = 661.40/x
  3. Step 3: Cross multiply
    1,585.21x = 2,376.79 × 661.40
  4. Step 4: Simplify right side
    1,585.21x = 1,572,008.91
  5. Step 5: Solve for x
    x = 1,572,008.91/1,585.21
  6. Step 6: Final answer
    x = 991.67

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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.