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Finding the Fourth Proportional to 1,228.51, 1,695.39 and 697.19

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Solution

The fourth proportional to 1,228.51, 1,695.39 and 697.19 is: 962.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,228.51 : 1,695.39 = 697.19 : x
  2. Step 2: Convert to fraction form
    1,228.51/1,695.39 = 697.19/x
  3. Step 3: Cross multiply
    1,228.51x = 1,695.39 × 697.19
  4. Step 4: Simplify right side
    1,228.51x = 1,182,008.95
  5. Step 5: Solve for x
    x = 1,182,008.95/1,228.51
  6. Step 6: Final answer
    x = 962.15

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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.