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Finding the Fourth Proportional to 1,065.72, 1,470.47 and 623.54

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Solution

The fourth proportional to 1,065.72, 1,470.47 and 623.54 is: 860.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.72 : 1,470.47 = 623.54 : x
  2. Step 2: Convert to fraction form
    1,065.72/1,470.47 = 623.54/x
  3. Step 3: Cross multiply
    1,065.72x = 1,470.47 × 623.54
  4. Step 4: Simplify right side
    1,065.72x = 916,886.39
  5. Step 5: Solve for x
    x = 916,886.39/1,065.72
  6. Step 6: Final answer
    x = 860.34

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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.