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Finding the Fourth Proportional to 1,056.78, 1,585.71 and 407.97

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Solution

The fourth proportional to 1,056.78, 1,585.71 and 407.97 is: 612.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.78 : 1,585.71 = 407.97 : x
  2. Step 2: Convert to fraction form
    1,056.78/1,585.71 = 407.97/x
  3. Step 3: Cross multiply
    1,056.78x = 1,585.71 × 407.97
  4. Step 4: Simplify right side
    1,056.78x = 646,922.11
  5. Step 5: Solve for x
    x = 646,922.11/1,056.78
  6. Step 6: Final answer
    x = 612.16

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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.