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Finding the Fourth Proportional to 700.56, 1,042.79 and 690.17

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Solution

The fourth proportional to 700.56, 1,042.79 and 690.17 is: 1,027.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    700.56 : 1,042.79 = 690.17 : x
  2. Step 2: Convert to fraction form
    700.56/1,042.79 = 690.17/x
  3. Step 3: Cross multiply
    700.56x = 1,042.79 × 690.17
  4. Step 4: Simplify right side
    700.56x = 719,693.71
  5. Step 5: Solve for x
    x = 719,693.71/700.56
  6. Step 6: Final answer
    x = 1,027.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.