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Finding the Fourth Proportional to 1,117.69, 1,542.30 and 620.25

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Solution

The fourth proportional to 1,117.69, 1,542.30 and 620.25 is: 855.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.69 : 1,542.30 = 620.25 : x
  2. Step 2: Convert to fraction form
    1,117.69/1,542.30 = 620.25/x
  3. Step 3: Cross multiply
    1,117.69x = 1,542.30 × 620.25
  4. Step 4: Simplify right side
    1,117.69x = 956,611.58
  5. Step 5: Solve for x
    x = 956,611.58/1,117.69
  6. Step 6: Final answer
    x = 855.88

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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.