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Finding the Fourth Proportional to 1,148.98, 1,586.88 and 775.31

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Solution

The fourth proportional to 1,148.98, 1,586.88 and 775.31 is: 1,070.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,148.98 : 1,586.88 = 775.31 : x
  2. Step 2: Convert to fraction form
    1,148.98/1,586.88 = 775.31/x
  3. Step 3: Cross multiply
    1,148.98x = 1,586.88 × 775.31
  4. Step 4: Simplify right side
    1,148.98x = 1,230,323.93
  5. Step 5: Solve for x
    x = 1,230,323.93/1,148.98
  6. Step 6: Final answer
    x = 1,070.80

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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.