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Finding the Fourth Proportional to 1,117.34, 1,541.88 and 620

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Solution

The fourth proportional to 1,117.34, 1,541.88 and 620 is: 855.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.34 : 1,541.88 = 620 : x
  2. Step 2: Convert to fraction form
    1,117.34/1,541.88 = 620/x
  3. Step 3: Cross multiply
    1,117.34x = 1,541.88 × 620
  4. Step 4: Simplify right side
    1,117.34x = 955,965.60
  5. Step 5: Solve for x
    x = 955,965.60/1,117.34
  6. Step 6: Final answer
    x = 855.57

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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.