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Finding the Fourth Proportional to 1,065.70, 1,470.65 and 623.66

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Solution

The fourth proportional to 1,065.70, 1,470.65 and 623.66 is: 860.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,065.70 : 1,470.65 = 623.66 : x
  2. Step 2: Convert to fraction form
    1,065.70/1,470.65 = 623.66/x
  3. Step 3: Cross multiply
    1,065.70x = 1,470.65 × 623.66
  4. Step 4: Simplify right side
    1,065.70x = 917,186.14
  5. Step 5: Solve for x
    x = 917,186.14/1,065.70
  6. Step 6: Final answer
    x = 860.64

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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.