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Finding the Fourth Proportional to 1,585.65, 2,378.28 and 661.32

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Solution

The fourth proportional to 1,585.65, 2,378.28 and 661.32 is: 991.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.65 : 2,378.28 = 661.32 : x
  2. Step 2: Convert to fraction form
    1,585.65/2,378.28 = 661.32/x
  3. Step 3: Cross multiply
    1,585.65x = 2,378.28 × 661.32
  4. Step 4: Simplify right side
    1,585.65x = 1,572,804.13
  5. Step 5: Solve for x
    x = 1,572,804.13/1,585.65
  6. Step 6: Final answer
    x = 991.90

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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.