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Finding the Fourth Proportional to 1,235.68, 1,705.12 and 711.28

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Solution

The fourth proportional to 1,235.68, 1,705.12 and 711.28 is: 981.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.68 : 1,705.12 = 711.28 : x
  2. Step 2: Convert to fraction form
    1,235.68/1,705.12 = 711.28/x
  3. Step 3: Cross multiply
    1,235.68x = 1,705.12 × 711.28
  4. Step 4: Simplify right side
    1,235.68x = 1,212,817.75
  5. Step 5: Solve for x
    x = 1,212,817.75/1,235.68
  6. Step 6: Final answer
    x = 981.50

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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.