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Finding the Fourth Proportional to 858.48, 1,288.56 and 611.95

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Solution

The fourth proportional to 858.48, 1,288.56 and 611.95 is: 918.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.48 : 1,288.56 = 611.95 : x
  2. Step 2: Convert to fraction form
    858.48/1,288.56 = 611.95/x
  3. Step 3: Cross multiply
    858.48x = 1,288.56 × 611.95
  4. Step 4: Simplify right side
    858.48x = 788,534.29
  5. Step 5: Solve for x
    x = 788,534.29/858.48
  6. Step 6: Final answer
    x = 918.52

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.