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Finding the Fourth Proportional to 1,235.30, 1,704.77 and 711.32

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Solution

The fourth proportional to 1,235.30, 1,704.77 and 711.32 is: 981.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.30 : 1,704.77 = 711.32 : x
  2. Step 2: Convert to fraction form
    1,235.30/1,704.77 = 711.32/x
  3. Step 3: Cross multiply
    1,235.30x = 1,704.77 × 711.32
  4. Step 4: Simplify right side
    1,235.30x = 1,212,643.04
  5. Step 5: Solve for x
    x = 1,212,643.04/1,235.30
  6. Step 6: Final answer
    x = 981.66

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1.5x scale

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.