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Finding the Fourth Proportional to 1,585.56, 2,378.78 and 661.55

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Solution

The fourth proportional to 1,585.56, 2,378.78 and 661.55 is: 992.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.56 : 2,378.78 = 661.55 : x
  2. Step 2: Convert to fraction form
    1,585.56/2,378.78 = 661.55/x
  3. Step 3: Cross multiply
    1,585.56x = 2,378.78 × 661.55
  4. Step 4: Simplify right side
    1,585.56x = 1,573,678.60
  5. Step 5: Solve for x
    x = 1,573,678.60/1,585.56
  6. Step 6: Final answer
    x = 992.51

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1.5x scale

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.